drivers/net/wireless/iwlwifi/mvm/rs.c

   1 /******************************************************************************
   2  *
   3  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
   4  * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of version 2 of the GNU General Public License as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
  18  *
  19  * The full GNU General Public License is included in this distribution in the
  20  * file called LICENSE.
  21  *
  22  * Contact Information:
  23  *  Intel Linux Wireless <ilw@linux.intel.com>
  24  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  25  *
  26  *****************************************************************************/
  27 #include <linux/kernel.h>
  28 #include <linux/skbuff.h>
  29 #include <linux/slab.h>
  30 #include <net/mac80211.h>
  31
  32 #include <linux/netdevice.h>
  33 #include <linux/etherdevice.h>
  34 #include <linux/delay.h>
  35
  36 #include <linux/workqueue.h>
  37 #include "rs.h"
  38 #include "fw-api.h"
  39 #include "sta.h"
  40 #include "iwl-op-mode.h"
  41 #include "mvm.h"
  42
  43 #define RS_NAME "iwl-mvm-rs"
  44
  45 #define NUM_TRY_BEFORE_ANT_TOGGLE       1
  46 #define RS_LEGACY_RETRIES_PER_RATE      1
  47 #define RS_HT_VHT_RETRIES_PER_RATE      2
  48 #define RS_HT_VHT_RETRIES_PER_RATE_TW   1
  49 #define RS_INITIAL_MIMO_NUM_RATES       3
  50 #define RS_INITIAL_SISO_NUM_RATES       3
  51 #define RS_INITIAL_LEGACY_NUM_RATES     LINK_QUAL_MAX_RETRY_NUM
  52 #define RS_SECONDARY_LEGACY_NUM_RATES   LINK_QUAL_MAX_RETRY_NUM
  53 #define RS_SECONDARY_SISO_NUM_RATES     3
  54 #define RS_SECONDARY_SISO_RETRIES       1
  55
  56 #define IWL_RATE_MAX_WINDOW             62      /* # tx in history window */
  57 #define IWL_RATE_MIN_FAILURE_TH         3       /* min failures to calc tpt */
  58 #define IWL_RATE_MIN_SUCCESS_TH         8       /* min successes to calc tpt */
  59
  60 /* max allowed rate miss before sync LQ cmd */
  61 #define IWL_MISSED_RATE_MAX             15
  62 #define RS_STAY_IN_COLUMN_TIMEOUT       (5*HZ)
  63 #define RS_IDLE_TIMEOUT                 (5*HZ)
  64
  65 static u8 rs_ht_to_legacy[] = {
  66         [IWL_RATE_MCS_0_INDEX] = IWL_RATE_6M_INDEX,
  67         [IWL_RATE_MCS_1_INDEX] = IWL_RATE_9M_INDEX,
  68         [IWL_RATE_MCS_2_INDEX] = IWL_RATE_12M_INDEX,
  69         [IWL_RATE_MCS_3_INDEX] = IWL_RATE_18M_INDEX,
  70         [IWL_RATE_MCS_4_INDEX] = IWL_RATE_24M_INDEX,
  71         [IWL_RATE_MCS_5_INDEX] = IWL_RATE_36M_INDEX,
  72         [IWL_RATE_MCS_6_INDEX] = IWL_RATE_48M_INDEX,
  73         [IWL_RATE_MCS_7_INDEX] = IWL_RATE_54M_INDEX,
  74         [IWL_RATE_MCS_8_INDEX] = IWL_RATE_54M_INDEX,
  75         [IWL_RATE_MCS_9_INDEX] = IWL_RATE_54M_INDEX,
  76 };
  77
  78 static const u8 ant_toggle_lookup[] = {
  79         [ANT_NONE] = ANT_NONE,
  80         [ANT_A] = ANT_B,
  81         [ANT_B] = ANT_C,
  82         [ANT_AB] = ANT_BC,
  83         [ANT_C] = ANT_A,
  84         [ANT_AC] = ANT_AB,
  85         [ANT_BC] = ANT_AC,
  86         [ANT_ABC] = ANT_ABC,
  87 };
  88
  89 #define IWL_DECLARE_RATE_INFO(r, s, rp, rn)                           \
  90         [IWL_RATE_##r##M_INDEX] = { IWL_RATE_##r##M_PLCP,             \
  91                                     IWL_RATE_HT_SISO_MCS_##s##_PLCP,  \
  92                                     IWL_RATE_HT_MIMO2_MCS_##s##_PLCP, \
  93                                     IWL_RATE_VHT_SISO_MCS_##s##_PLCP, \
  94                                     IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP,\
  95                                     IWL_RATE_##rp##M_INDEX,           \
  96                                     IWL_RATE_##rn##M_INDEX }
  97
  98 #define IWL_DECLARE_MCS_RATE(s)                                           \
  99         [IWL_RATE_MCS_##s##_INDEX] = { IWL_RATE_INVM_PLCP,                \
 100                                        IWL_RATE_HT_SISO_MCS_##s##_PLCP,   \
 101                                        IWL_RATE_HT_MIMO2_MCS_##s##_PLCP,  \
 102                                        IWL_RATE_VHT_SISO_MCS_##s##_PLCP,  \
 103                                        IWL_RATE_VHT_MIMO2_MCS_##s##_PLCP, \
 104                                        IWL_RATE_INVM_INDEX,               \
 105                                        IWL_RATE_INVM_INDEX }
 106
 107 /*
 108  * Parameter order:
 109  *   rate, ht rate, prev rate, next rate
 110  *
 111  * If there isn't a valid next or previous rate then INV is used which
 112  * maps to IWL_RATE_INVALID
 113  *
 114  */
 115 static const struct iwl_rs_rate_info iwl_rates[IWL_RATE_COUNT] = {
 116         IWL_DECLARE_RATE_INFO(1, INV, INV, 2),   /*  1mbps */
 117         IWL_DECLARE_RATE_INFO(2, INV, 1, 5),     /*  2mbps */
 118         IWL_DECLARE_RATE_INFO(5, INV, 2, 11),    /*5.5mbps */
 119         IWL_DECLARE_RATE_INFO(11, INV, 9, 12),   /* 11mbps */
 120         IWL_DECLARE_RATE_INFO(6, 0, 5, 11),      /*  6mbps ; MCS 0 */
 121         IWL_DECLARE_RATE_INFO(9, INV, 6, 11),    /*  9mbps */
 122         IWL_DECLARE_RATE_INFO(12, 1, 11, 18),    /* 12mbps ; MCS 1 */
 123         IWL_DECLARE_RATE_INFO(18, 2, 12, 24),    /* 18mbps ; MCS 2 */
 124         IWL_DECLARE_RATE_INFO(24, 3, 18, 36),    /* 24mbps ; MCS 3 */
 125         IWL_DECLARE_RATE_INFO(36, 4, 24, 48),    /* 36mbps ; MCS 4 */
 126         IWL_DECLARE_RATE_INFO(48, 5, 36, 54),    /* 48mbps ; MCS 5 */
 127         IWL_DECLARE_RATE_INFO(54, 6, 48, INV),   /* 54mbps ; MCS 6 */
 128         IWL_DECLARE_MCS_RATE(7),                 /* MCS 7 */
 129         IWL_DECLARE_MCS_RATE(8),                 /* MCS 8 */
 130         IWL_DECLARE_MCS_RATE(9),                 /* MCS 9 */
 131 };
 132
 133 enum rs_action {
 134         RS_ACTION_STAY = 0,
 135         RS_ACTION_DOWNSCALE = -1,
 136         RS_ACTION_UPSCALE = 1,
 137 };
 138
 139 enum rs_column_mode {
 140         RS_INVALID = 0,
 141         RS_LEGACY,
 142         RS_SISO,
 143         RS_MIMO2,
 144 };
 145
 146 #define MAX_NEXT_COLUMNS 7
 147 #define MAX_COLUMN_CHECKS 3
 148
 149 typedef bool (*allow_column_func_t) (struct iwl_mvm *mvm,
 150                                      struct ieee80211_sta *sta,
 151                                      struct iwl_scale_tbl_info *tbl);
 152
 153 struct rs_tx_column {
 154         enum rs_column_mode mode;
 155         u8 ant;
 156         bool sgi;
 157         enum rs_column next_columns[MAX_NEXT_COLUMNS];
 158         allow_column_func_t checks[MAX_COLUMN_CHECKS];
 159 };
 160
 161 static bool rs_mimo_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 162                           struct iwl_scale_tbl_info *tbl)
 163 {
 164         if (!sta->ht_cap.ht_supported)
 165                 return false;
 166
 167         if (sta->smps_mode == IEEE80211_SMPS_STATIC)
 168                 return false;
 169
 170         if (num_of_ant(mvm->fw->valid_tx_ant) < 2)
 171                 return false;
 172
 173         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
 174                 return false;
 175
 176         return true;
 177 }
 178
 179 static bool rs_siso_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 180                           struct iwl_scale_tbl_info *tbl)
 181 {
 182         if (!sta->ht_cap.ht_supported)
 183                 return false;
 184
 185         return true;
 186 }
 187
 188 static bool rs_sgi_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
 189                          struct iwl_scale_tbl_info *tbl)
 190 {
 191         struct rs_rate *rate = &tbl->rate;
 192         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
 193         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
 194
 195         if (is_ht20(rate) && (ht_cap->cap &
 196                              IEEE80211_HT_CAP_SGI_20))
 197                 return true;
 198         if (is_ht40(rate) && (ht_cap->cap &
 199                              IEEE80211_HT_CAP_SGI_40))
 200                 return true;
 201         if (is_ht80(rate) && (vht_cap->cap &
 202                              IEEE80211_VHT_CAP_SHORT_GI_80))
 203                 return true;
 204
 205         return false;
 206 }
 207
 208 static const struct rs_tx_column rs_tx_columns[] = {
 209         [RS_COLUMN_LEGACY_ANT_A] = {
 210                 .mode = RS_LEGACY,
 211                 .ant = ANT_A,
 212                 .next_columns = {
 213                         RS_COLUMN_LEGACY_ANT_B,
 214                         RS_COLUMN_SISO_ANT_A,
 215                         RS_COLUMN_MIMO2,
 216                         RS_COLUMN_INVALID,
 217                         RS_COLUMN_INVALID,
 218                         RS_COLUMN_INVALID,
 219                         RS_COLUMN_INVALID,
 220                 },
 221         },
 222         [RS_COLUMN_LEGACY_ANT_B] = {
 223                 .mode = RS_LEGACY,
 224                 .ant = ANT_B,
 225                 .next_columns = {
 226                         RS_COLUMN_LEGACY_ANT_A,
 227                         RS_COLUMN_SISO_ANT_B,
 228                         RS_COLUMN_MIMO2,
 229                         RS_COLUMN_INVALID,
 230                         RS_COLUMN_INVALID,
 231                         RS_COLUMN_INVALID,
 232                         RS_COLUMN_INVALID,
 233                 },
 234         },
 235         [RS_COLUMN_SISO_ANT_A] = {
 236                 .mode = RS_SISO,
 237                 .ant = ANT_A,
 238                 .next_columns = {
 239                         RS_COLUMN_SISO_ANT_B,
 240                         RS_COLUMN_MIMO2,
 241                         RS_COLUMN_SISO_ANT_A_SGI,
 242                         RS_COLUMN_LEGACY_ANT_A,
 243                         RS_COLUMN_LEGACY_ANT_B,
 244                         RS_COLUMN_INVALID,
 245                         RS_COLUMN_INVALID,
 246                 },
 247                 .checks = {
 248                         rs_siso_allow,
 249                 },
 250         },
 251         [RS_COLUMN_SISO_ANT_B] = {
 252                 .mode = RS_SISO,
 253                 .ant = ANT_B,
 254                 .next_columns = {
 255                         RS_COLUMN_SISO_ANT_A,
 256                         RS_COLUMN_MIMO2,
 257                         RS_COLUMN_SISO_ANT_B_SGI,
 258                         RS_COLUMN_LEGACY_ANT_A,
 259                         RS_COLUMN_LEGACY_ANT_B,
 260                         RS_COLUMN_INVALID,
 261                         RS_COLUMN_INVALID,
 262                 },
 263                 .checks = {
 264                         rs_siso_allow,
 265                 },
 266         },
 267         [RS_COLUMN_SISO_ANT_A_SGI] = {
 268                 .mode = RS_SISO,
 269                 .ant = ANT_A,
 270                 .sgi = true,
 271                 .next_columns = {
 272                         RS_COLUMN_SISO_ANT_B_SGI,
 273                         RS_COLUMN_MIMO2_SGI,
 274                         RS_COLUMN_SISO_ANT_A,
 275                         RS_COLUMN_LEGACY_ANT_A,
 276                         RS_COLUMN_LEGACY_ANT_B,
 277                         RS_COLUMN_INVALID,
 278                         RS_COLUMN_INVALID,
 279                 },
 280                 .checks = {
 281                         rs_siso_allow,
 282                         rs_sgi_allow,
 283                 },
 284         },
 285         [RS_COLUMN_SISO_ANT_B_SGI] = {
 286                 .mode = RS_SISO,
 287                 .ant = ANT_B,
 288                 .sgi = true,
 289                 .next_columns = {
 290                         RS_COLUMN_SISO_ANT_A_SGI,
 291                         RS_COLUMN_MIMO2_SGI,
 292                         RS_COLUMN_SISO_ANT_B,
 293                         RS_COLUMN_LEGACY_ANT_A,
 294                         RS_COLUMN_LEGACY_ANT_B,
 295                         RS_COLUMN_INVALID,
 296                         RS_COLUMN_INVALID,
 297                 },
 298                 .checks = {
 299                         rs_siso_allow,
 300                         rs_sgi_allow,
 301                 },
 302         },
 303         [RS_COLUMN_MIMO2] = {
 304                 .mode = RS_MIMO2,
 305                 .ant = ANT_AB,
 306                 .next_columns = {
 307                         RS_COLUMN_SISO_ANT_A,
 308                         RS_COLUMN_MIMO2_SGI,
 309                         RS_COLUMN_LEGACY_ANT_A,
 310                         RS_COLUMN_LEGACY_ANT_B,
 311                         RS_COLUMN_INVALID,
 312                         RS_COLUMN_INVALID,
 313                         RS_COLUMN_INVALID,
 314                 },
 315                 .checks = {
 316                         rs_mimo_allow,
 317                 },
 318         },
 319         [RS_COLUMN_MIMO2_SGI] = {
 320                 .mode = RS_MIMO2,
 321                 .ant = ANT_AB,
 322                 .sgi = true,
 323                 .next_columns = {
 324                         RS_COLUMN_SISO_ANT_A_SGI,
 325                         RS_COLUMN_MIMO2,
 326                         RS_COLUMN_LEGACY_ANT_A,
 327                         RS_COLUMN_LEGACY_ANT_B,
 328                         RS_COLUMN_INVALID,
 329                         RS_COLUMN_INVALID,
 330                         RS_COLUMN_INVALID,
 331                 },
 332                 .checks = {
 333                         rs_mimo_allow,
 334                         rs_sgi_allow,
 335                 },
 336         },
 337 };
 338
 339 static inline u8 rs_extract_rate(u32 rate_n_flags)
 340 {
 341         /* also works for HT because bits 7:6 are zero there */
 342         return (u8)(rate_n_flags & RATE_LEGACY_RATE_MSK);
 343 }
 344
 345 static int iwl_hwrate_to_plcp_idx(u32 rate_n_flags)
 346 {
 347         int idx = 0;
 348
 349         if (rate_n_flags & RATE_MCS_HT_MSK) {
 350                 idx = rate_n_flags & RATE_HT_MCS_RATE_CODE_MSK;
 351                 idx += IWL_RATE_MCS_0_INDEX;
 352
 353                 /* skip 9M not supported in HT*/
 354                 if (idx >= IWL_RATE_9M_INDEX)
 355                         idx += 1;
 356                 if ((idx >= IWL_FIRST_HT_RATE) && (idx <= IWL_LAST_HT_RATE))
 357                         return idx;
 358         } else if (rate_n_flags & RATE_MCS_VHT_MSK) {
 359                 idx = rate_n_flags & RATE_VHT_MCS_RATE_CODE_MSK;
 360                 idx += IWL_RATE_MCS_0_INDEX;
 361
 362                 /* skip 9M not supported in VHT*/
 363                 if (idx >= IWL_RATE_9M_INDEX)
 364                         idx++;
 365                 if ((idx >= IWL_FIRST_VHT_RATE) && (idx <= IWL_LAST_VHT_RATE))
 366                         return idx;
 367         } else {
 368                 /* legacy rate format, search for match in table */
 369
 370                 u8 legacy_rate = rs_extract_rate(rate_n_flags);
 371                 for (idx = 0; idx < ARRAY_SIZE(iwl_rates); idx++)
 372                         if (iwl_rates[idx].plcp == legacy_rate)
 373                                 return idx;
 374         }
 375
 376         return IWL_RATE_INVALID;
 377 }
 378
 379 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 380                                   struct ieee80211_sta *sta,
 381                                   struct iwl_lq_sta *lq_sta,
 382                                   int tid);
 383 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
 384                            struct ieee80211_sta *sta,
 385                            struct iwl_lq_sta *lq_sta,
 386                            const struct rs_rate *initial_rate);
 387 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search);
 388
 389 /**
 390  * The following tables contain the expected throughput metrics for all rates
 391  *
 392  *      1, 2, 5.5, 11, 6, 9, 12, 18, 24, 36, 48, 54, 60 MBits
 393  *
 394  * where invalid entries are zeros.
 395  *
 396  * CCK rates are only valid in legacy table and will only be used in G
 397  * (2.4 GHz) band.
 398  */
 399
 400 static const u16 expected_tpt_legacy[IWL_RATE_COUNT] = {
 401         7, 13, 35, 58, 40, 57, 72, 98, 121, 154, 177, 186, 0, 0, 0
 402 };
 403
 404 /* Expected TpT tables. 4 indexes:
 405  * 0 - NGI, 1 - SGI, 2 - AGG+NGI, 3 - AGG+SGI
 406  */
 407 static const u16 expected_tpt_siso_20MHz[4][IWL_RATE_COUNT] = {
 408         {0, 0, 0, 0, 42, 0,  76, 102, 124, 159, 183, 193, 202, 216, 0},
 409         {0, 0, 0, 0, 46, 0,  82, 110, 132, 168, 192, 202, 210, 225, 0},
 410         {0, 0, 0, 0, 49, 0,  97, 145, 192, 285, 375, 420, 464, 551, 0},
 411         {0, 0, 0, 0, 54, 0, 108, 160, 213, 315, 415, 465, 513, 608, 0},
 412 };
 413
 414 static const u16 expected_tpt_siso_40MHz[4][IWL_RATE_COUNT] = {
 415         {0, 0, 0, 0,  77, 0, 127, 160, 184, 220, 242, 250,  257,  269,  275},
 416         {0, 0, 0, 0,  83, 0, 135, 169, 193, 229, 250, 257,  264,  275,  280},
 417         {0, 0, 0, 0, 101, 0, 199, 295, 389, 570, 744, 828,  911, 1070, 1173},
 418         {0, 0, 0, 0, 112, 0, 220, 326, 429, 629, 819, 912, 1000, 1173, 1284},
 419 };
 420
 421 static const u16 expected_tpt_siso_80MHz[4][IWL_RATE_COUNT] = {
 422         {0, 0, 0, 0, 130, 0, 191, 223, 244,  273,  288,  294,  298,  305,  308},
 423         {0, 0, 0, 0, 138, 0, 200, 231, 251,  279,  293,  298,  302,  308,  312},
 424         {0, 0, 0, 0, 217, 0, 429, 634, 834, 1220, 1585, 1760, 1931, 2258, 2466},
 425         {0, 0, 0, 0, 241, 0, 475, 701, 921, 1343, 1741, 1931, 2117, 2468, 2691},
 426 };
 427
 428 static const u16 expected_tpt_mimo2_20MHz[4][IWL_RATE_COUNT] = {
 429         {0, 0, 0, 0,  74, 0, 123, 155, 179, 213, 235, 243, 250,  261, 0},
 430         {0, 0, 0, 0,  81, 0, 131, 164, 187, 221, 242, 250, 256,  267, 0},
 431         {0, 0, 0, 0,  98, 0, 193, 286, 375, 550, 718, 799, 878, 1032, 0},
 432         {0, 0, 0, 0, 109, 0, 214, 316, 414, 607, 790, 879, 965, 1132, 0},
 433 };
 434
 435 static const u16 expected_tpt_mimo2_40MHz[4][IWL_RATE_COUNT] = {
 436         {0, 0, 0, 0, 123, 0, 182, 214, 235,  264,  279,  285,  289,  296,  300},
 437         {0, 0, 0, 0, 131, 0, 191, 222, 242,  270,  284,  289,  293,  300,  303},
 438         {0, 0, 0, 0, 200, 0, 390, 571, 741, 1067, 1365, 1505, 1640, 1894, 2053},
 439         {0, 0, 0, 0, 221, 0, 430, 630, 816, 1169, 1490, 1641, 1784, 2053, 2221},
 440 };
 441
 442 static const u16 expected_tpt_mimo2_80MHz[4][IWL_RATE_COUNT] = {
 443         {0, 0, 0, 0, 182, 0, 240,  264,  278,  299,  308,  311,  313,  317,  319},
 444         {0, 0, 0, 0, 190, 0, 247,  269,  282,  302,  310,  313,  315,  319,  320},
 445         {0, 0, 0, 0, 428, 0, 833, 1215, 1577, 2254, 2863, 3147, 3418, 3913, 4219},
 446         {0, 0, 0, 0, 474, 0, 920, 1338, 1732, 2464, 3116, 3418, 3705, 4225, 4545},
 447 };
 448
 449 /* mbps, mcs */
 450 static const struct iwl_rate_mcs_info iwl_rate_mcs[IWL_RATE_COUNT] = {
 451         {  "1", "BPSK DSSS"},
 452         {  "2", "QPSK DSSS"},
 453         {"5.5", "BPSK CCK"},
 454         { "11", "QPSK CCK"},
 455         {  "6", "BPSK 1/2"},
 456         {  "9", "BPSK 1/2"},
 457         { "12", "QPSK 1/2"},
 458         { "18", "QPSK 3/4"},
 459         { "24", "16QAM 1/2"},
 460         { "36", "16QAM 3/4"},
 461         { "48", "64QAM 2/3"},
 462         { "54", "64QAM 3/4"},
 463         { "60", "64QAM 5/6"},
 464 };
 465
 466 #define MCS_INDEX_PER_STREAM    (8)
 467
 468 static const char *rs_pretty_ant(u8 ant)
 469 {
 470         static const char * const ant_name[] = {
 471                 [ANT_NONE] = "None",
 472                 [ANT_A]    = "A",
 473                 [ANT_B]    = "B",
 474                 [ANT_AB]   = "AB",
 475                 [ANT_C]    = "C",
 476                 [ANT_AC]   = "AC",
 477                 [ANT_BC]   = "BC",
 478                 [ANT_ABC]  = "ABC",
 479         };
 480
 481         if (ant > ANT_ABC)
 482                 return "UNKNOWN";
 483
 484         return ant_name[ant];
 485 }
 486
 487 static const char *rs_pretty_lq_type(enum iwl_table_type type)
 488 {
 489         static const char * const lq_types[] = {
 490                 [LQ_NONE] = "NONE",
 491                 [LQ_LEGACY_A] = "LEGACY_A",
 492                 [LQ_LEGACY_G] = "LEGACY_G",
 493                 [LQ_HT_SISO] = "HT SISO",
 494                 [LQ_HT_MIMO2] = "HT MIMO",
 495                 [LQ_VHT_SISO] = "VHT SISO",
 496                 [LQ_VHT_MIMO2] = "VHT MIMO",
 497         };
 498
 499         if (type < LQ_NONE || type >= LQ_MAX)
 500                 return "UNKNOWN";
 501
 502         return lq_types[type];
 503 }
 504
 505 static inline void rs_dump_rate(struct iwl_mvm *mvm, const struct rs_rate *rate,
 506                                 const char *prefix)
 507 {
 508         IWL_DEBUG_RATE(mvm,
 509                        "%s: (%s: %d) ANT: %s BW: %d SGI: %d LDPC: %d STBC %d\n",
 510                        prefix, rs_pretty_lq_type(rate->type),
 511                        rate->index, rs_pretty_ant(rate->ant),
 512                        rate->bw, rate->sgi, rate->ldpc, rate->stbc);
 513 }
 514
 515 static void rs_rate_scale_clear_window(struct iwl_rate_scale_data *window)
 516 {
 517         window->data = 0;
 518         window->success_counter = 0;
 519         window->success_ratio = IWL_INVALID_VALUE;
 520         window->counter = 0;
 521         window->average_tpt = IWL_INVALID_VALUE;
 522 }
 523
 524 static void rs_rate_scale_clear_tbl_windows(struct iwl_mvm *mvm,
 525                                             struct iwl_scale_tbl_info *tbl)
 526 {
 527         int i;
 528
 529         IWL_DEBUG_RATE(mvm, "Clearing up window stats\n");
 530         for (i = 0; i < IWL_RATE_COUNT; i++)
 531                 rs_rate_scale_clear_window(&tbl->win[i]);
 532
 533         for (i = 0; i < ARRAY_SIZE(tbl->tpc_win); i++)
 534                 rs_rate_scale_clear_window(&tbl->tpc_win[i]);
 535 }
 536
 537 static inline u8 rs_is_valid_ant(u8 valid_antenna, u8 ant_type)
 538 {
 539         return (ant_type & valid_antenna) == ant_type;
 540 }
 541
 542 static int rs_tl_turn_on_agg_for_tid(struct iwl_mvm *mvm,
 543                                       struct iwl_lq_sta *lq_data, u8 tid,
 544                                       struct ieee80211_sta *sta)
 545 {
 546         int ret = -EAGAIN;
 547
 548         IWL_DEBUG_HT(mvm, "Starting Tx agg: STA: %pM tid: %d\n",
 549                      sta->addr, tid);
 550         ret = ieee80211_start_tx_ba_session(sta, tid, 5000);
 551         if (ret == -EAGAIN) {
 552                 /*
 553                  * driver and mac80211 is out of sync
 554                  * this might be cause by reloading firmware
 555                  * stop the tx ba session here
 556                  */
 557                 IWL_ERR(mvm, "Fail start Tx agg on tid: %d\n",
 558                         tid);
 559                 ieee80211_stop_tx_ba_session(sta, tid);
 560         }
 561         return ret;
 562 }
 563
 564 static void rs_tl_turn_on_agg(struct iwl_mvm *mvm, u8 tid,
 565                               struct iwl_lq_sta *lq_data,
 566                               struct ieee80211_sta *sta)
 567 {
 568         if (tid < IWL_MAX_TID_COUNT)
 569                 rs_tl_turn_on_agg_for_tid(mvm, lq_data, tid, sta);
 570         else
 571                 IWL_ERR(mvm, "tid exceeds max TID count: %d/%d\n",
 572                         tid, IWL_MAX_TID_COUNT);
 573 }
 574
 575 static inline int get_num_of_ant_from_rate(u32 rate_n_flags)
 576 {
 577         return !!(rate_n_flags & RATE_MCS_ANT_A_MSK) +
 578                !!(rate_n_flags & RATE_MCS_ANT_B_MSK) +
 579                !!(rate_n_flags & RATE_MCS_ANT_C_MSK);
 580 }
 581
 582 /*
 583  * Static function to get the expected throughput from an iwl_scale_tbl_info
 584  * that wraps a NULL pointer check
 585  */
 586 static s32 get_expected_tpt(struct iwl_scale_tbl_info *tbl, int rs_index)
 587 {
 588         if (tbl->expected_tpt)
 589                 return tbl->expected_tpt[rs_index];
 590         return 0;
 591 }
 592
 593 /**
 594  * rs_collect_tx_data - Update the success/failure sliding window
 595  *
 596  * We keep a sliding window of the last 62 packets transmitted
 597  * at this rate.  window->data contains the bitmask of successful
 598  * packets.
 599  */
 600 static int _rs_collect_tx_data(struct iwl_scale_tbl_info *tbl,
 601                                int scale_index, int attempts, int successes,
 602                                struct iwl_rate_scale_data *window)
 603 {
 604         static const u64 mask = (((u64)1) << (IWL_RATE_MAX_WINDOW - 1));
 605         s32 fail_count, tpt;
 606
 607         /* Get expected throughput */
 608         tpt = get_expected_tpt(tbl, scale_index);
 609
 610         /*
 611          * Keep track of only the latest 62 tx frame attempts in this rate's
 612          * history window; anything older isn't really relevant any more.
 613          * If we have filled up the sliding window, drop the oldest attempt;
 614          * if the oldest attempt (highest bit in bitmap) shows "success",
 615          * subtract "1" from the success counter (this is the main reason
 616          * we keep these bitmaps!).
 617          */
 618         while (attempts > 0) {
 619                 if (window->counter >= IWL_RATE_MAX_WINDOW) {
 620                         /* remove earliest */
 621                         window->counter = IWL_RATE_MAX_WINDOW - 1;
 622
 623                         if (window->data & mask) {
 624                                 window->data &= ~mask;
 625                                 window->success_counter--;
 626                         }
 627                 }
 628
 629                 /* Increment frames-attempted counter */
 630                 window->counter++;
 631
 632                 /* Shift bitmap by one frame to throw away oldest history */
 633                 window->data <<= 1;
 634
 635                 /* Mark the most recent #successes attempts as successful */
 636                 if (successes > 0) {
 637                         window->success_counter++;
 638                         window->data |= 0x1;
 639                         successes--;
 640                 }
 641
 642                 attempts--;
 643         }
 644
 645         /* Calculate current success ratio, avoid divide-by-0! */
 646         if (window->counter > 0)
 647                 window->success_ratio = 128 * (100 * window->success_counter)
 648                                         / window->counter;
 649         else
 650                 window->success_ratio = IWL_INVALID_VALUE;
 651
 652         fail_count = window->counter - window->success_counter;
 653
 654         /* Calculate average throughput, if we have enough history. */
 655         if ((fail_count >= IWL_RATE_MIN_FAILURE_TH) ||
 656             (window->success_counter >= IWL_RATE_MIN_SUCCESS_TH))
 657                 window->average_tpt = (window->success_ratio * tpt + 64) / 128;
 658         else
 659                 window->average_tpt = IWL_INVALID_VALUE;
 660
 661         return 0;
 662 }
 663
 664 static int rs_collect_tx_data(struct iwl_lq_sta *lq_sta,
 665                               struct iwl_scale_tbl_info *tbl,
 666                               int scale_index, int attempts, int successes,
 667                               u8 reduced_txp)
 668 {
 669         struct iwl_rate_scale_data *window = NULL;
 670         int ret;
 671
 672         if (scale_index < 0 || scale_index >= IWL_RATE_COUNT)
 673                 return -EINVAL;
 674
 675         if (tbl->column != RS_COLUMN_INVALID) {
 676                 struct lq_sta_pers *pers = &lq_sta->pers;
 677
 678                 pers->tx_stats[tbl->column][scale_index].total += attempts;
 679                 pers->tx_stats[tbl->column][scale_index].success += successes;
 680         }
 681
 682         /* Select window for current tx bit rate */
 683         window = &(tbl->win[scale_index]);
 684
 685         ret = _rs_collect_tx_data(tbl, scale_index, attempts, successes,
 686                                   window);
 687         if (ret)
 688                 return ret;
 689
 690         if (WARN_ON_ONCE(reduced_txp > TPC_MAX_REDUCTION))
 691                 return -EINVAL;
 692
 693         window = &tbl->tpc_win[reduced_txp];
 694         return _rs_collect_tx_data(tbl, scale_index, attempts, successes,
 695                                    window);
 696 }
 697
 698 /* Convert rs_rate object into ucode rate bitmask */
 699 static u32 ucode_rate_from_rs_rate(struct iwl_mvm *mvm,
 700                                   struct rs_rate *rate)
 701 {
 702         u32 ucode_rate = 0;
 703         int index = rate->index;
 704
 705         ucode_rate |= ((rate->ant << RATE_MCS_ANT_POS) &
 706                          RATE_MCS_ANT_ABC_MSK);
 707
 708         if (is_legacy(rate)) {
 709                 ucode_rate |= iwl_rates[index].plcp;
 710                 if (index >= IWL_FIRST_CCK_RATE && index <= IWL_LAST_CCK_RATE)
 711                         ucode_rate |= RATE_MCS_CCK_MSK;
 712                 return ucode_rate;
 713         }
 714
 715         if (is_ht(rate)) {
 716                 if (index < IWL_FIRST_HT_RATE || index > IWL_LAST_HT_RATE) {
 717                         IWL_ERR(mvm, "Invalid HT rate index %d\n", index);
 718                         index = IWL_LAST_HT_RATE;
 719                 }
 720                 ucode_rate |= RATE_MCS_HT_MSK;
 721
 722                 if (is_ht_siso(rate))
 723                         ucode_rate |= iwl_rates[index].plcp_ht_siso;
 724                 else if (is_ht_mimo2(rate))
 725                         ucode_rate |= iwl_rates[index].plcp_ht_mimo2;
 726                 else
 727                         WARN_ON_ONCE(1);
 728         } else if (is_vht(rate)) {
 729                 if (index < IWL_FIRST_VHT_RATE || index > IWL_LAST_VHT_RATE) {
 730                         IWL_ERR(mvm, "Invalid VHT rate index %d\n", index);
 731                         index = IWL_LAST_VHT_RATE;
 732                 }
 733                 ucode_rate |= RATE_MCS_VHT_MSK;
 734                 if (is_vht_siso(rate))
 735                         ucode_rate |= iwl_rates[index].plcp_vht_siso;
 736                 else if (is_vht_mimo2(rate))
 737                         ucode_rate |= iwl_rates[index].plcp_vht_mimo2;
 738                 else
 739                         WARN_ON_ONCE(1);
 740
 741         } else {
 742                 IWL_ERR(mvm, "Invalid rate->type %d\n", rate->type);
 743         }
 744
 745         if (is_siso(rate) && rate->stbc) {
 746                 /* To enable STBC we need to set both a flag and ANT_AB */
 747                 ucode_rate |= RATE_MCS_ANT_AB_MSK;
 748                 ucode_rate |= RATE_MCS_VHT_STBC_MSK;
 749         }
 750
 751         ucode_rate |= rate->bw;
 752         if (rate->sgi)
 753                 ucode_rate |= RATE_MCS_SGI_MSK;
 754         if (rate->ldpc)
 755                 ucode_rate |= RATE_MCS_LDPC_MSK;
 756
 757         return ucode_rate;
 758 }
 759
 760 /* Convert a ucode rate into an rs_rate object */
 761 static int rs_rate_from_ucode_rate(const u32 ucode_rate,
 762                                    enum ieee80211_band band,
 763                                    struct rs_rate *rate)
 764 {
 765         u32 ant_msk = ucode_rate & RATE_MCS_ANT_ABC_MSK;
 766         u8 num_of_ant = get_num_of_ant_from_rate(ucode_rate);
 767         u8 nss;
 768
 769         memset(rate, 0, sizeof(*rate));
 770         rate->index = iwl_hwrate_to_plcp_idx(ucode_rate);
 771
 772         if (rate->index == IWL_RATE_INVALID)
 773                 return -EINVAL;
 774
 775         rate->ant = (ant_msk >> RATE_MCS_ANT_POS);
 776
 777         /* Legacy */
 778         if (!(ucode_rate & RATE_MCS_HT_MSK) &&
 779             !(ucode_rate & RATE_MCS_VHT_MSK)) {
 780                 if (num_of_ant == 1) {
 781                         if (band == IEEE80211_BAND_5GHZ)
 782                                 rate->type = LQ_LEGACY_A;
 783                         else
 784                                 rate->type = LQ_LEGACY_G;
 785                 }
 786
 787                 return 0;
 788         }
 789
 790         /* HT or VHT */
 791         if (ucode_rate & RATE_MCS_SGI_MSK)
 792                 rate->sgi = true;
 793         if (ucode_rate & RATE_MCS_LDPC_MSK)
 794                 rate->ldpc = true;
 795         if (ucode_rate & RATE_MCS_VHT_STBC_MSK)
 796                 rate->stbc = true;
 797
 798         rate->bw = ucode_rate & RATE_MCS_CHAN_WIDTH_MSK;
 799
 800         if (ucode_rate & RATE_MCS_HT_MSK) {
 801                 nss = ((ucode_rate & RATE_HT_MCS_NSS_MSK) >>
 802                        RATE_HT_MCS_NSS_POS) + 1;
 803
 804                 if (nss == 1) {
 805                         rate->type = LQ_HT_SISO;
 806                         WARN_ON_ONCE(!rate->stbc && num_of_ant != 1);
 807                 } else if (nss == 2) {
 808                         rate->type = LQ_HT_MIMO2;
 809                         WARN_ON_ONCE(num_of_ant != 2);
 810                 } else {
 811                         WARN_ON_ONCE(1);
 812                 }
 813         } else if (ucode_rate & RATE_MCS_VHT_MSK) {
 814                 nss = ((ucode_rate & RATE_VHT_MCS_NSS_MSK) >>
 815                        RATE_VHT_MCS_NSS_POS) + 1;
 816
 817                 if (nss == 1) {
 818                         rate->type = LQ_VHT_SISO;
 819                         WARN_ON_ONCE(num_of_ant != 1);
 820                 } else if (nss == 2) {
 821                         rate->type = LQ_VHT_MIMO2;
 822                         WARN_ON_ONCE(num_of_ant != 2);
 823                 } else {
 824                         WARN_ON_ONCE(1);
 825                 }
 826         }
 827
 828         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_160);
 829         WARN_ON_ONCE(rate->bw == RATE_MCS_CHAN_WIDTH_80 &&
 830                      !is_vht(rate));
 831
 832         return 0;
 833 }
 834
 835 /* switch to another antenna/antennas and return 1 */
 836 /* if no other valid antenna found, return 0 */
 837 static int rs_toggle_antenna(u32 valid_ant, struct rs_rate *rate)
 838 {
 839         u8 new_ant_type;
 840
 841         if (!rate->ant || rate->ant > ANT_ABC)
 842                 return 0;
 843
 844         if (!rs_is_valid_ant(valid_ant, rate->ant))
 845                 return 0;
 846
 847         new_ant_type = ant_toggle_lookup[rate->ant];
 848
 849         while ((new_ant_type != rate->ant) &&
 850                !rs_is_valid_ant(valid_ant, new_ant_type))
 851                 new_ant_type = ant_toggle_lookup[new_ant_type];
 852
 853         if (new_ant_type == rate->ant)
 854                 return 0;
 855
 856         rate->ant = new_ant_type;
 857
 858         return 1;
 859 }
 860
 861 static u16 rs_get_supported_rates(struct iwl_lq_sta *lq_sta,
 862                                   struct rs_rate *rate)
 863 {
 864         if (is_legacy(rate))
 865                 return lq_sta->active_legacy_rate;
 866         else if (is_siso(rate))
 867                 return lq_sta->active_siso_rate;
 868         else if (is_mimo2(rate))
 869                 return lq_sta->active_mimo2_rate;
 870
 871         WARN_ON_ONCE(1);
 872         return 0;
 873 }
 874
 875 static u16 rs_get_adjacent_rate(struct iwl_mvm *mvm, u8 index, u16 rate_mask,
 876                                 int rate_type)
 877 {
 878         u8 high = IWL_RATE_INVALID;
 879         u8 low = IWL_RATE_INVALID;
 880
 881         /* 802.11A or ht walks to the next literal adjacent rate in
 882          * the rate table */
 883         if (is_type_a_band(rate_type) || !is_type_legacy(rate_type)) {
 884                 int i;
 885                 u32 mask;
 886
 887                 /* Find the previous rate that is in the rate mask */
 888                 i = index - 1;
 889                 for (mask = (1 << i); i >= 0; i--, mask >>= 1) {
 890                         if (rate_mask & mask) {
 891                                 low = i;
 892                                 break;
 893                         }
 894                 }
 895
 896                 /* Find the next rate that is in the rate mask */
 897                 i = index + 1;
 898                 for (mask = (1 << i); i < IWL_RATE_COUNT; i++, mask <<= 1) {
 899                         if (rate_mask & mask) {
 900                                 high = i;
 901                                 break;
 902                         }
 903                 }
 904
 905                 return (high << 8) | low;
 906         }
 907
 908         low = index;
 909         while (low != IWL_RATE_INVALID) {
 910                 low = iwl_rates[low].prev_rs;
 911                 if (low == IWL_RATE_INVALID)
 912                         break;
 913                 if (rate_mask & (1 << low))
 914                         break;
 915                 IWL_DEBUG_RATE(mvm, "Skipping masked lower rate: %d\n", low);
 916         }
 917
 918         high = index;
 919         while (high != IWL_RATE_INVALID) {
 920                 high = iwl_rates[high].next_rs;
 921                 if (high == IWL_RATE_INVALID)
 922                         break;
 923                 if (rate_mask & (1 << high))
 924                         break;
 925                 IWL_DEBUG_RATE(mvm, "Skipping masked higher rate: %d\n", high);
 926         }
 927
 928         return (high << 8) | low;
 929 }
 930
 931 static inline bool rs_rate_supported(struct iwl_lq_sta *lq_sta,
 932                                      struct rs_rate *rate)
 933 {
 934         return BIT(rate->index) & rs_get_supported_rates(lq_sta, rate);
 935 }
 936
 937 /* Get the next supported lower rate in the current column.
 938  * Return true if bottom rate in the current column was reached
 939  */
 940 static bool rs_get_lower_rate_in_column(struct iwl_lq_sta *lq_sta,
 941                                         struct rs_rate *rate)
 942 {
 943         u8 low;
 944         u16 high_low;
 945         u16 rate_mask;
 946         struct iwl_mvm *mvm = lq_sta->pers.drv;
 947
 948         rate_mask = rs_get_supported_rates(lq_sta, rate);
 949         high_low = rs_get_adjacent_rate(mvm, rate->index, rate_mask,
 950                                         rate->type);
 951         low = high_low & 0xff;
 952
 953         /* Bottom rate of column reached */
 954         if (low == IWL_RATE_INVALID)
 955                 return true;
 956
 957         rate->index = low;
 958         return false;
 959 }
 960
 961 /* Get the next rate to use following a column downgrade */
 962 static void rs_get_lower_rate_down_column(struct iwl_lq_sta *lq_sta,
 963                                           struct rs_rate *rate)
 964 {
 965         struct iwl_mvm *mvm = lq_sta->pers.drv;
 966
 967         if (is_legacy(rate)) {
 968                 /* No column to downgrade from Legacy */
 969                 return;
 970         } else if (is_siso(rate)) {
 971                 /* Downgrade to Legacy if we were in SISO */
 972                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
 973                         rate->type = LQ_LEGACY_A;
 974                 else
 975                         rate->type = LQ_LEGACY_G;
 976
 977                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
 978
 979                 WARN_ON_ONCE(rate->index < IWL_RATE_MCS_0_INDEX ||
 980                              rate->index > IWL_RATE_MCS_9_INDEX);
 981
 982                 rate->index = rs_ht_to_legacy[rate->index];
 983                 rate->ldpc = false;
 984         } else {
 985                 /* Downgrade to SISO with same MCS if in MIMO  */
 986                 rate->type = is_vht_mimo2(rate) ?
 987                         LQ_VHT_SISO : LQ_HT_SISO;
 988         }
 989
 990         if (num_of_ant(rate->ant) > 1)
 991                 rate->ant = first_antenna(mvm->fw->valid_tx_ant);
 992
 993         /* Relevant in both switching to SISO or Legacy */
 994         rate->sgi = false;
 995
 996         if (!rs_rate_supported(lq_sta, rate))
 997                 rs_get_lower_rate_in_column(lq_sta, rate);
 998 }
 999
1000 /* Simple function to compare two rate scale table types */
1001 static inline bool rs_rate_match(struct rs_rate *a,
1002                                  struct rs_rate *b)
1003 {
1004         bool ant_match;
1005
1006         if (a->stbc)
1007                 ant_match = (b->ant == ANT_A || b->ant == ANT_B);
1008         else
1009                 ant_match = (a->ant == b->ant);
1010
1011         return (a->type == b->type) && (a->bw == b->bw) && (a->sgi == b->sgi)
1012                 && ant_match;
1013 }
1014
1015 static u32 rs_ch_width_from_mac_flags(enum mac80211_rate_control_flags flags)
1016 {
1017         if (flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
1018                 return RATE_MCS_CHAN_WIDTH_40;
1019         else if (flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
1020                 return RATE_MCS_CHAN_WIDTH_80;
1021         else if (flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
1022                 return RATE_MCS_CHAN_WIDTH_160;
1023
1024         return RATE_MCS_CHAN_WIDTH_20;
1025 }
1026
1027 static u8 rs_get_tid(struct ieee80211_hdr *hdr)
1028 {
1029         u8 tid = IWL_MAX_TID_COUNT;
1030
1031         if (ieee80211_is_data_qos(hdr->frame_control)) {
1032                 u8 *qc = ieee80211_get_qos_ctl(hdr);
1033                 tid = qc[0] & 0xf;
1034         }
1035
1036         if (unlikely(tid > IWL_MAX_TID_COUNT))
1037                 tid = IWL_MAX_TID_COUNT;
1038
1039         return tid;
1040 }
1041
1042 void iwl_mvm_rs_tx_status(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1043                           int tid, struct ieee80211_tx_info *info)
1044 {
1045         int legacy_success;
1046         int retries;
1047         int mac_index, i;
1048         struct iwl_lq_cmd *table;
1049         enum mac80211_rate_control_flags mac_flags;
1050         u32 ucode_rate;
1051         struct rs_rate rate;
1052         struct iwl_scale_tbl_info *curr_tbl, *other_tbl, *tmp_tbl;
1053         u8 reduced_txp = (uintptr_t)info->status.status_driver_data[0];
1054         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1055         struct iwl_lq_sta *lq_sta = &mvmsta->lq_sta;
1056
1057         /* Treat uninitialized rate scaling data same as non-existing. */
1058         if (!lq_sta) {
1059                 IWL_DEBUG_RATE(mvm, "Station rate scaling not created yet.\n");
1060                 return;
1061         } else if (!lq_sta->pers.drv) {
1062                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
1063                 return;
1064         }
1065
1066 #ifdef CONFIG_MAC80211_DEBUGFS
1067         /* Disable last tx check if we are debugging with fixed rate */
1068         if (lq_sta->pers.dbg_fixed_rate) {
1069                 IWL_DEBUG_RATE(mvm, "Fixed rate. avoid rate scaling\n");
1070                 return;
1071         }
1072 #endif
1073         /* This packet was aggregated but doesn't carry status info */
1074         if ((info->flags & IEEE80211_TX_CTL_AMPDU) &&
1075             !(info->flags & IEEE80211_TX_STAT_AMPDU))
1076                 return;
1077
1078         /*
1079          * Ignore this Tx frame response if its initial rate doesn't match
1080          * that of latest Link Quality command.  There may be stragglers
1081          * from a previous Link Quality command, but we're no longer interested
1082          * in those; they're either from the "active" mode while we're trying
1083          * to check "search" mode, or a prior "search" mode after we've moved
1084          * to a new "search" mode (which might become the new "active" mode).
1085          */
1086         table = &lq_sta->lq;
1087         ucode_rate = le32_to_cpu(table->rs_table[0]);
1088         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1089         if (info->band == IEEE80211_BAND_5GHZ)
1090                 rate.index -= IWL_FIRST_OFDM_RATE;
1091         mac_flags = info->status.rates[0].flags;
1092         mac_index = info->status.rates[0].idx;
1093         /* For HT packets, map MCS to PLCP */
1094         if (mac_flags & IEEE80211_TX_RC_MCS) {
1095                 /* Remove # of streams */
1096                 mac_index &= RATE_HT_MCS_RATE_CODE_MSK;
1097                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1098                         mac_index++;
1099                 /*
1100                  * mac80211 HT index is always zero-indexed; we need to move
1101                  * HT OFDM rates after CCK rates in 2.4 GHz band
1102                  */
1103                 if (info->band == IEEE80211_BAND_2GHZ)
1104                         mac_index += IWL_FIRST_OFDM_RATE;
1105         } else if (mac_flags & IEEE80211_TX_RC_VHT_MCS) {
1106                 mac_index &= RATE_VHT_MCS_RATE_CODE_MSK;
1107                 if (mac_index >= (IWL_RATE_9M_INDEX - IWL_FIRST_OFDM_RATE))
1108                         mac_index++;
1109         }
1110
1111         if (time_after(jiffies,
1112                        (unsigned long)(lq_sta->last_tx + RS_IDLE_TIMEOUT))) {
1113                 int tid;
1114                 IWL_DEBUG_RATE(mvm, "Tx idle for too long. reinit rs\n");
1115                 for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
1116                         ieee80211_stop_tx_ba_session(sta, tid);
1117
1118                 iwl_mvm_rs_rate_init(mvm, sta, info->band, false);
1119                 return;
1120         }
1121         lq_sta->last_tx = jiffies;
1122
1123         /* Here we actually compare this rate to the latest LQ command */
1124         if ((mac_index < 0) ||
1125             (rate.sgi != !!(mac_flags & IEEE80211_TX_RC_SHORT_GI)) ||
1126             (rate.bw != rs_ch_width_from_mac_flags(mac_flags)) ||
1127             (rate.ant != info->status.antenna) ||
1128             (!!(ucode_rate & RATE_MCS_HT_MSK) !=
1129              !!(mac_flags & IEEE80211_TX_RC_MCS)) ||
1130             (!!(ucode_rate & RATE_MCS_VHT_MSK) !=
1131              !!(mac_flags & IEEE80211_TX_RC_VHT_MCS)) ||
1132             (!!(ucode_rate & RATE_HT_MCS_GF_MSK) !=
1133              !!(mac_flags & IEEE80211_TX_RC_GREEN_FIELD)) ||
1134             (rate.index != mac_index)) {
1135                 IWL_DEBUG_RATE(mvm,
1136                                "initial rate %d does not match %d (0x%x)\n",
1137                                mac_index, rate.index, ucode_rate);
1138                 /*
1139                  * Since rates mis-match, the last LQ command may have failed.
1140                  * After IWL_MISSED_RATE_MAX mis-matches, resync the uCode with
1141                  * ... driver.
1142                  */
1143                 lq_sta->missed_rate_counter++;
1144                 if (lq_sta->missed_rate_counter > IWL_MISSED_RATE_MAX) {
1145                         lq_sta->missed_rate_counter = 0;
1146                         IWL_DEBUG_RATE(mvm,
1147                                        "Too many rates mismatch. Send sync LQ. rs_state %d\n",
1148                                        lq_sta->rs_state);
1149                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1150                 }
1151                 /* Regardless, ignore this status info for outdated rate */
1152                 return;
1153         } else
1154                 /* Rate did match, so reset the missed_rate_counter */
1155                 lq_sta->missed_rate_counter = 0;
1156
1157         /* Figure out if rate scale algorithm is in active or search table */
1158         if (rs_rate_match(&rate,
1159                           &(lq_sta->lq_info[lq_sta->active_tbl].rate))) {
1160                 curr_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1161                 other_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1162         } else if (rs_rate_match(&rate,
1163                          &lq_sta->lq_info[1 - lq_sta->active_tbl].rate)) {
1164                 curr_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1165                 other_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1166         } else {
1167                 IWL_DEBUG_RATE(mvm,
1168                                "Neither active nor search matches tx rate\n");
1169                 tmp_tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1170                 rs_dump_rate(mvm, &tmp_tbl->rate, "ACTIVE");
1171                 tmp_tbl = &(lq_sta->lq_info[1 - lq_sta->active_tbl]);
1172                 rs_dump_rate(mvm, &tmp_tbl->rate, "SEARCH");
1173                 rs_dump_rate(mvm, &rate, "ACTUAL");
1174
1175                 /*
1176                  * no matching table found, let's by-pass the data collection
1177                  * and continue to perform rate scale to find the rate table
1178                  */
1179                 rs_stay_in_table(lq_sta, true);
1180                 goto done;
1181         }
1182
1183         /*
1184          * Updating the frame history depends on whether packets were
1185          * aggregated.
1186          *
1187          * For aggregation, all packets were transmitted at the same rate, the
1188          * first index into rate scale table.
1189          */
1190         if (info->flags & IEEE80211_TX_STAT_AMPDU) {
1191                 ucode_rate = le32_to_cpu(table->rs_table[0]);
1192                 rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1193                 rs_collect_tx_data(lq_sta, curr_tbl, rate.index,
1194                                    info->status.ampdu_len,
1195                                    info->status.ampdu_ack_len,
1196                                    reduced_txp);
1197
1198                 /* Update success/fail counts if not searching for new mode */
1199                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1200                         lq_sta->total_success += info->status.ampdu_ack_len;
1201                         lq_sta->total_failed += (info->status.ampdu_len -
1202                                         info->status.ampdu_ack_len);
1203                 }
1204         } else {
1205         /*
1206          * For legacy, update frame history with for each Tx retry.
1207          */
1208                 retries = info->status.rates[0].count - 1;
1209                 /* HW doesn't send more than 15 retries */
1210                 retries = min(retries, 15);
1211
1212                 /* The last transmission may have been successful */
1213                 legacy_success = !!(info->flags & IEEE80211_TX_STAT_ACK);
1214                 /* Collect data for each rate used during failed TX attempts */
1215                 for (i = 0; i <= retries; ++i) {
1216                         ucode_rate = le32_to_cpu(table->rs_table[i]);
1217                         rs_rate_from_ucode_rate(ucode_rate, info->band, &rate);
1218                         /*
1219                          * Only collect stats if retried rate is in the same RS
1220                          * table as active/search.
1221                          */
1222                         if (rs_rate_match(&rate, &curr_tbl->rate))
1223                                 tmp_tbl = curr_tbl;
1224                         else if (rs_rate_match(&rate, &other_tbl->rate))
1225                                 tmp_tbl = other_tbl;
1226                         else
1227                                 continue;
1228
1229                         rs_collect_tx_data(lq_sta, tmp_tbl, rate.index, 1,
1230                                            i < retries ? 0 : legacy_success,
1231                                            reduced_txp);
1232                 }
1233
1234                 /* Update success/fail counts if not searching for new mode */
1235                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1236                         lq_sta->total_success += legacy_success;
1237                         lq_sta->total_failed += retries + (1 - legacy_success);
1238                 }
1239         }
1240         /* The last TX rate is cached in lq_sta; it's set in if/else above */
1241         lq_sta->last_rate_n_flags = ucode_rate;
1242         IWL_DEBUG_RATE(mvm, "reduced txpower: %d\n", reduced_txp);
1243 done:
1244         /* See if there's a better rate or modulation mode to try. */
1245         if (sta->supp_rates[info->band])
1246                 rs_rate_scale_perform(mvm, sta, lq_sta, tid);
1247 }
1248
1249 /*
1250  * mac80211 sends us Tx status
1251  */
1252 static void rs_mac80211_tx_status(void *mvm_r,
1253                                   struct ieee80211_supported_band *sband,
1254                                   struct ieee80211_sta *sta, void *priv_sta,
1255                                   struct sk_buff *skb)
1256 {
1257         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1258         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_r;
1259         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
1260         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1261
1262         if (!ieee80211_is_data(hdr->frame_control) ||
1263             info->flags & IEEE80211_TX_CTL_NO_ACK)
1264                 return;
1265
1266         iwl_mvm_rs_tx_status(mvm, sta, rs_get_tid(hdr), info);
1267 }
1268
1269 /*
1270  * Begin a period of staying with a selected modulation mode.
1271  * Set "stay_in_tbl" flag to prevent any mode switches.
1272  * Set frame tx success limits according to legacy vs. high-throughput,
1273  * and reset overall (spanning all rates) tx success history statistics.
1274  * These control how long we stay using same modulation mode before
1275  * searching for a new mode.
1276  */
1277 static void rs_set_stay_in_table(struct iwl_mvm *mvm, u8 is_legacy,
1278                                  struct iwl_lq_sta *lq_sta)
1279 {
1280         IWL_DEBUG_RATE(mvm, "Moving to RS_STATE_STAY_IN_COLUMN\n");
1281         lq_sta->rs_state = RS_STATE_STAY_IN_COLUMN;
1282         if (is_legacy) {
1283                 lq_sta->table_count_limit = IWL_LEGACY_TABLE_COUNT;
1284                 lq_sta->max_failure_limit = IWL_LEGACY_FAILURE_LIMIT;
1285                 lq_sta->max_success_limit = IWL_LEGACY_SUCCESS_LIMIT;
1286         } else {
1287                 lq_sta->table_count_limit = IWL_NONE_LEGACY_TABLE_COUNT;
1288                 lq_sta->max_failure_limit = IWL_NONE_LEGACY_FAILURE_LIMIT;
1289                 lq_sta->max_success_limit = IWL_NONE_LEGACY_SUCCESS_LIMIT;
1290         }
1291         lq_sta->table_count = 0;
1292         lq_sta->total_failed = 0;
1293         lq_sta->total_success = 0;
1294         lq_sta->flush_timer = jiffies;
1295         lq_sta->visited_columns = 0;
1296 }
1297
1298 static int rs_get_max_allowed_rate(struct iwl_lq_sta *lq_sta,
1299                                    const struct rs_tx_column *column)
1300 {
1301         switch (column->mode) {
1302         case RS_LEGACY:
1303                 return lq_sta->max_legacy_rate_idx;
1304         case RS_SISO:
1305                 return lq_sta->max_siso_rate_idx;
1306         case RS_MIMO2:
1307                 return lq_sta->max_mimo2_rate_idx;
1308         default:
1309                 WARN_ON_ONCE(1);
1310         }
1311
1312         return lq_sta->max_legacy_rate_idx;
1313 }
1314
1315 static const u16 *rs_get_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1316                                             const struct rs_tx_column *column,
1317                                             u32 bw)
1318 {
1319         /* Used to choose among HT tables */
1320         const u16 (*ht_tbl_pointer)[IWL_RATE_COUNT];
1321
1322         if (WARN_ON_ONCE(column->mode != RS_LEGACY &&
1323                          column->mode != RS_SISO &&
1324                          column->mode != RS_MIMO2))
1325                 return expected_tpt_legacy;
1326
1327         /* Legacy rates have only one table */
1328         if (column->mode == RS_LEGACY)
1329                 return expected_tpt_legacy;
1330
1331         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1332         /* Choose among many HT tables depending on number of streams
1333          * (SISO/MIMO2), channel width (20/40/80), SGI, and aggregation
1334          * status */
1335         if (column->mode == RS_SISO) {
1336                 switch (bw) {
1337                 case RATE_MCS_CHAN_WIDTH_20:
1338                         ht_tbl_pointer = expected_tpt_siso_20MHz;
1339                         break;
1340                 case RATE_MCS_CHAN_WIDTH_40:
1341                         ht_tbl_pointer = expected_tpt_siso_40MHz;
1342                         break;
1343                 case RATE_MCS_CHAN_WIDTH_80:
1344                         ht_tbl_pointer = expected_tpt_siso_80MHz;
1345                         break;
1346                 default:
1347                         WARN_ON_ONCE(1);
1348                 }
1349         } else if (column->mode == RS_MIMO2) {
1350                 switch (bw) {
1351                 case RATE_MCS_CHAN_WIDTH_20:
1352                         ht_tbl_pointer = expected_tpt_mimo2_20MHz;
1353                         break;
1354                 case RATE_MCS_CHAN_WIDTH_40:
1355                         ht_tbl_pointer = expected_tpt_mimo2_40MHz;
1356                         break;
1357                 case RATE_MCS_CHAN_WIDTH_80:
1358                         ht_tbl_pointer = expected_tpt_mimo2_80MHz;
1359                         break;
1360                 default:
1361                         WARN_ON_ONCE(1);
1362                 }
1363         } else {
1364                 WARN_ON_ONCE(1);
1365         }
1366
1367         if (!column->sgi && !lq_sta->is_agg)            /* Normal */
1368                 return ht_tbl_pointer[0];
1369         else if (column->sgi && !lq_sta->is_agg)        /* SGI */
1370                 return ht_tbl_pointer[1];
1371         else if (!column->sgi && lq_sta->is_agg)        /* AGG */
1372                 return ht_tbl_pointer[2];
1373         else                                            /* AGG+SGI */
1374                 return ht_tbl_pointer[3];
1375 }
1376
1377 static void rs_set_expected_tpt_table(struct iwl_lq_sta *lq_sta,
1378                                       struct iwl_scale_tbl_info *tbl)
1379 {
1380         struct rs_rate *rate = &tbl->rate;
1381         const struct rs_tx_column *column = &rs_tx_columns[tbl->column];
1382
1383         tbl->expected_tpt = rs_get_expected_tpt_table(lq_sta, column, rate->bw);
1384 }
1385
1386 static s32 rs_get_best_rate(struct iwl_mvm *mvm,
1387                             struct iwl_lq_sta *lq_sta,
1388                             struct iwl_scale_tbl_info *tbl,     /* "search" */
1389                             unsigned long rate_mask, s8 index)
1390 {
1391         struct iwl_scale_tbl_info *active_tbl =
1392             &(lq_sta->lq_info[lq_sta->active_tbl]);
1393         s32 success_ratio = active_tbl->win[index].success_ratio;
1394         u16 expected_current_tpt = active_tbl->expected_tpt[index];
1395         const u16 *tpt_tbl = tbl->expected_tpt;
1396         u16 high_low;
1397         u32 target_tpt;
1398         int rate_idx;
1399
1400         if (success_ratio > RS_SR_NO_DECREASE) {
1401                 target_tpt = 100 * expected_current_tpt;
1402                 IWL_DEBUG_RATE(mvm,
1403                                "SR %d high. Find rate exceeding EXPECTED_CURRENT %d\n",
1404                                success_ratio, target_tpt);
1405         } else {
1406                 target_tpt = lq_sta->last_tpt;
1407                 IWL_DEBUG_RATE(mvm,
1408                                "SR %d not thag good. Find rate exceeding ACTUAL_TPT %d\n",
1409                                success_ratio, target_tpt);
1410         }
1411
1412         rate_idx = find_first_bit(&rate_mask, BITS_PER_LONG);
1413
1414         while (rate_idx != IWL_RATE_INVALID) {
1415                 if (target_tpt < (100 * tpt_tbl[rate_idx]))
1416                         break;
1417
1418                 high_low = rs_get_adjacent_rate(mvm, rate_idx, rate_mask,
1419                                                 tbl->rate.type);
1420
1421                 rate_idx = (high_low >> 8) & 0xff;
1422         }
1423
1424         IWL_DEBUG_RATE(mvm, "Best rate found %d target_tp %d expected_new %d\n",
1425                        rate_idx, target_tpt,
1426                        rate_idx != IWL_RATE_INVALID ?
1427                        100 * tpt_tbl[rate_idx] : IWL_INVALID_VALUE);
1428
1429         return rate_idx;
1430 }
1431
1432 static u32 rs_bw_from_sta_bw(struct ieee80211_sta *sta)
1433 {
1434         if (sta->bandwidth >= IEEE80211_STA_RX_BW_80)
1435                 return RATE_MCS_CHAN_WIDTH_80;
1436         else if (sta->bandwidth >= IEEE80211_STA_RX_BW_40)
1437                 return RATE_MCS_CHAN_WIDTH_40;
1438
1439         return RATE_MCS_CHAN_WIDTH_20;
1440 }
1441
1442 /*
1443  * Check whether we should continue using same modulation mode, or
1444  * begin search for a new mode, based on:
1445  * 1) # tx successes or failures while using this mode
1446  * 2) # times calling this function
1447  * 3) elapsed time in this mode (not used, for now)
1448  */
1449 static void rs_stay_in_table(struct iwl_lq_sta *lq_sta, bool force_search)
1450 {
1451         struct iwl_scale_tbl_info *tbl;
1452         int active_tbl;
1453         int flush_interval_passed = 0;
1454         struct iwl_mvm *mvm;
1455
1456         mvm = lq_sta->pers.drv;
1457         active_tbl = lq_sta->active_tbl;
1458
1459         tbl = &(lq_sta->lq_info[active_tbl]);
1460
1461         /* If we've been disallowing search, see if we should now allow it */
1462         if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN) {
1463                 /* Elapsed time using current modulation mode */
1464                 if (lq_sta->flush_timer)
1465                         flush_interval_passed =
1466                                 time_after(jiffies,
1467                                            (unsigned long)(lq_sta->flush_timer +
1468                                                 RS_STAY_IN_COLUMN_TIMEOUT));
1469
1470                 /*
1471                  * Check if we should allow search for new modulation mode.
1472                  * If many frames have failed or succeeded, or we've used
1473                  * this same modulation for a long time, allow search, and
1474                  * reset history stats that keep track of whether we should
1475                  * allow a new search.  Also (below) reset all bitmaps and
1476                  * stats in active history.
1477                  */
1478                 if (force_search ||
1479                     (lq_sta->total_failed > lq_sta->max_failure_limit) ||
1480                     (lq_sta->total_success > lq_sta->max_success_limit) ||
1481                     ((!lq_sta->search_better_tbl) &&
1482                      (lq_sta->flush_timer) && (flush_interval_passed))) {
1483                         IWL_DEBUG_RATE(mvm,
1484                                        "LQ: stay is expired %d %d %d\n",
1485                                      lq_sta->total_failed,
1486                                      lq_sta->total_success,
1487                                      flush_interval_passed);
1488
1489                         /* Allow search for new mode */
1490                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_STARTED;
1491                         IWL_DEBUG_RATE(mvm,
1492                                        "Moving to RS_STATE_SEARCH_CYCLE_STARTED\n");
1493                         lq_sta->total_failed = 0;
1494                         lq_sta->total_success = 0;
1495                         lq_sta->flush_timer = 0;
1496                         /* mark the current column as visited */
1497                         lq_sta->visited_columns = BIT(tbl->column);
1498                 /*
1499                  * Else if we've used this modulation mode enough repetitions
1500                  * (regardless of elapsed time or success/failure), reset
1501                  * history bitmaps and rate-specific stats for all rates in
1502                  * active table.
1503                  */
1504                 } else {
1505                         lq_sta->table_count++;
1506                         if (lq_sta->table_count >=
1507                             lq_sta->table_count_limit) {
1508                                 lq_sta->table_count = 0;
1509
1510                                 IWL_DEBUG_RATE(mvm,
1511                                                "LQ: stay in table clear win\n");
1512                                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
1513                         }
1514                 }
1515
1516                 /* If transitioning to allow "search", reset all history
1517                  * bitmaps and stats in active table (this will become the new
1518                  * "search" table). */
1519                 if (lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED) {
1520                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
1521                 }
1522         }
1523 }
1524
1525 /*
1526  * setup rate table in uCode
1527  */
1528 static void rs_update_rate_tbl(struct iwl_mvm *mvm,
1529                                struct ieee80211_sta *sta,
1530                                struct iwl_lq_sta *lq_sta,
1531                                struct rs_rate *rate)
1532 {
1533         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
1534         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
1535 }
1536
1537 static enum rs_column rs_get_next_column(struct iwl_mvm *mvm,
1538                                          struct iwl_lq_sta *lq_sta,
1539                                          struct ieee80211_sta *sta,
1540                                          struct iwl_scale_tbl_info *tbl)
1541 {
1542         int i, j, max_rate;
1543         enum rs_column next_col_id;
1544         const struct rs_tx_column *curr_col = &rs_tx_columns[tbl->column];
1545         const struct rs_tx_column *next_col;
1546         allow_column_func_t allow_func;
1547         u8 valid_ants = mvm->fw->valid_tx_ant;
1548         const u16 *expected_tpt_tbl;
1549         u16 tpt, max_expected_tpt;
1550
1551         for (i = 0; i < MAX_NEXT_COLUMNS; i++) {
1552                 next_col_id = curr_col->next_columns[i];
1553
1554                 if (next_col_id == RS_COLUMN_INVALID)
1555                         continue;
1556
1557                 if (lq_sta->visited_columns & BIT(next_col_id)) {
1558                         IWL_DEBUG_RATE(mvm, "Skip already visited column %d\n",
1559                                        next_col_id);
1560                         continue;
1561                 }
1562
1563                 next_col = &rs_tx_columns[next_col_id];
1564
1565                 if (!rs_is_valid_ant(valid_ants, next_col->ant)) {
1566                         IWL_DEBUG_RATE(mvm,
1567                                        "Skip column %d as ANT config isn't supported by chip. valid_ants 0x%x column ant 0x%x\n",
1568                                        next_col_id, valid_ants, next_col->ant);
1569                         continue;
1570                 }
1571
1572                 for (j = 0; j < MAX_COLUMN_CHECKS; j++) {
1573                         allow_func = next_col->checks[j];
1574                         if (allow_func && !allow_func(mvm, sta, tbl))
1575                                 break;
1576                 }
1577
1578                 if (j != MAX_COLUMN_CHECKS) {
1579                         IWL_DEBUG_RATE(mvm,
1580                                        "Skip column %d: not allowed (check %d failed)\n",
1581                                        next_col_id, j);
1582
1583                         continue;
1584                 }
1585
1586                 tpt = lq_sta->last_tpt / 100;
1587                 expected_tpt_tbl = rs_get_expected_tpt_table(lq_sta, next_col,
1588                                                      rs_bw_from_sta_bw(sta));
1589                 if (WARN_ON_ONCE(!expected_tpt_tbl))
1590                         continue;
1591
1592                 max_rate = rs_get_max_allowed_rate(lq_sta, next_col);
1593                 if (WARN_ON_ONCE(max_rate == IWL_RATE_INVALID))
1594                         continue;
1595
1596                 max_expected_tpt = expected_tpt_tbl[max_rate];
1597                 if (tpt >= max_expected_tpt) {
1598                         IWL_DEBUG_RATE(mvm,
1599                                        "Skip column %d: can't beat current TPT. Max expected %d current %d\n",
1600                                        next_col_id, max_expected_tpt, tpt);
1601                         continue;
1602                 }
1603
1604                 IWL_DEBUG_RATE(mvm,
1605                                "Found potential column %d. Max expected %d current %d\n",
1606                                next_col_id, max_expected_tpt, tpt);
1607                 break;
1608         }
1609
1610         if (i == MAX_NEXT_COLUMNS)
1611                 return RS_COLUMN_INVALID;
1612
1613         return next_col_id;
1614 }
1615
1616 static int rs_switch_to_column(struct iwl_mvm *mvm,
1617                                struct iwl_lq_sta *lq_sta,
1618                                struct ieee80211_sta *sta,
1619                                enum rs_column col_id)
1620 {
1621         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
1622         struct iwl_scale_tbl_info *search_tbl =
1623                                 &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
1624         struct rs_rate *rate = &search_tbl->rate;
1625         const struct rs_tx_column *column = &rs_tx_columns[col_id];
1626         const struct rs_tx_column *curr_column = &rs_tx_columns[tbl->column];
1627         u32 sz = (sizeof(struct iwl_scale_tbl_info) -
1628                   (sizeof(struct iwl_rate_scale_data) * IWL_RATE_COUNT));
1629         unsigned long rate_mask = 0;
1630         u32 rate_idx = 0;
1631
1632         memcpy(search_tbl, tbl, sz);
1633
1634         rate->sgi = column->sgi;
1635         rate->ant = column->ant;
1636
1637         if (column->mode == RS_LEGACY) {
1638                 if (lq_sta->band == IEEE80211_BAND_5GHZ)
1639                         rate->type = LQ_LEGACY_A;
1640                 else
1641                         rate->type = LQ_LEGACY_G;
1642
1643                 rate->bw = RATE_MCS_CHAN_WIDTH_20;
1644                 rate->ldpc = false;
1645                 rate_mask = lq_sta->active_legacy_rate;
1646         } else if (column->mode == RS_SISO) {
1647                 rate->type = lq_sta->is_vht ? LQ_VHT_SISO : LQ_HT_SISO;
1648                 rate_mask = lq_sta->active_siso_rate;
1649         } else if (column->mode == RS_MIMO2) {
1650                 rate->type = lq_sta->is_vht ? LQ_VHT_MIMO2 : LQ_HT_MIMO2;
1651                 rate_mask = lq_sta->active_mimo2_rate;
1652         } else {
1653                 WARN_ON_ONCE("Bad column mode");
1654         }
1655
1656         if (column->mode != RS_LEGACY) {
1657                 rate->bw = rs_bw_from_sta_bw(sta);
1658                 rate->ldpc = lq_sta->ldpc;
1659         }
1660
1661         search_tbl->column = col_id;
1662         rs_set_expected_tpt_table(lq_sta, search_tbl);
1663
1664         lq_sta->visited_columns |= BIT(col_id);
1665
1666         /* Get the best matching rate if we're changing modes. e.g.
1667          * SISO->MIMO, LEGACY->SISO, MIMO->SISO
1668          */
1669         if (curr_column->mode != column->mode) {
1670                 rate_idx = rs_get_best_rate(mvm, lq_sta, search_tbl,
1671                                             rate_mask, rate->index);
1672
1673                 if ((rate_idx == IWL_RATE_INVALID) ||
1674                     !(BIT(rate_idx) & rate_mask)) {
1675                         IWL_DEBUG_RATE(mvm,
1676                                        "can not switch with index %d"
1677                                        " rate mask %lx\n",
1678                                        rate_idx, rate_mask);
1679
1680                         goto err;
1681                 }
1682
1683                 rate->index = rate_idx;
1684         }
1685
1686         IWL_DEBUG_RATE(mvm, "Switched to column %d: Index %d\n",
1687                        col_id, rate->index);
1688
1689         return 0;
1690
1691 err:
1692         rate->type = LQ_NONE;
1693         return -1;
1694 }
1695
1696 static enum rs_action rs_get_rate_action(struct iwl_mvm *mvm,
1697                                          struct iwl_scale_tbl_info *tbl,
1698                                          s32 sr, int low, int high,
1699                                          int current_tpt,
1700                                          int low_tpt, int high_tpt)
1701 {
1702         enum rs_action action = RS_ACTION_STAY;
1703
1704         if ((sr <= RS_SR_FORCE_DECREASE) || (current_tpt == 0)) {
1705                 IWL_DEBUG_RATE(mvm,
1706                                "Decrease rate because of low SR\n");
1707                 return RS_ACTION_DOWNSCALE;
1708         }
1709
1710         if ((low_tpt == IWL_INVALID_VALUE) &&
1711             (high_tpt == IWL_INVALID_VALUE) &&
1712             (high != IWL_RATE_INVALID)) {
1713                 IWL_DEBUG_RATE(mvm,
1714                                "No data about high/low rates. Increase rate\n");
1715                 return RS_ACTION_UPSCALE;
1716         }
1717
1718         if ((high_tpt == IWL_INVALID_VALUE) &&
1719             (high != IWL_RATE_INVALID) &&
1720             (low_tpt != IWL_INVALID_VALUE) &&
1721             (low_tpt < current_tpt)) {
1722                 IWL_DEBUG_RATE(mvm,
1723                                "No data about high rate and low rate is worse. Increase rate\n");
1724                 return RS_ACTION_UPSCALE;
1725         }
1726
1727         if ((high_tpt != IWL_INVALID_VALUE) &&
1728             (high_tpt > current_tpt)) {
1729                 IWL_DEBUG_RATE(mvm,
1730                                "Higher rate is better. Increate rate\n");
1731                 return RS_ACTION_UPSCALE;
1732         }
1733
1734         if ((low_tpt != IWL_INVALID_VALUE) &&
1735             (high_tpt != IWL_INVALID_VALUE) &&
1736             (low_tpt < current_tpt) &&
1737             (high_tpt < current_tpt)) {
1738                 IWL_DEBUG_RATE(mvm,
1739                                "Both high and low are worse. Maintain rate\n");
1740                 return RS_ACTION_STAY;
1741         }
1742
1743         if ((low_tpt != IWL_INVALID_VALUE) &&
1744             (low_tpt > current_tpt)) {
1745                 IWL_DEBUG_RATE(mvm,
1746                                "Lower rate is better\n");
1747                 action = RS_ACTION_DOWNSCALE;
1748                 goto out;
1749         }
1750
1751         if ((low_tpt == IWL_INVALID_VALUE) &&
1752             (low != IWL_RATE_INVALID)) {
1753                 IWL_DEBUG_RATE(mvm,
1754                                "No data about lower rate\n");
1755                 action = RS_ACTION_DOWNSCALE;
1756                 goto out;
1757         }
1758
1759         IWL_DEBUG_RATE(mvm, "Maintain rate\n");
1760
1761 out:
1762         if ((action == RS_ACTION_DOWNSCALE) && (low != IWL_RATE_INVALID)) {
1763                 if (sr >= RS_SR_NO_DECREASE) {
1764                         IWL_DEBUG_RATE(mvm,
1765                                        "SR is above NO DECREASE. Avoid downscale\n");
1766                         action = RS_ACTION_STAY;
1767                 } else if (current_tpt > (100 * tbl->expected_tpt[low])) {
1768                         IWL_DEBUG_RATE(mvm,
1769                                        "Current TPT is higher than max expected in low rate. Avoid downscale\n");
1770                         action = RS_ACTION_STAY;
1771                 } else {
1772                         IWL_DEBUG_RATE(mvm, "Decrease rate\n");
1773                 }
1774         }
1775
1776         return action;
1777 }
1778
1779 static bool rs_stbc_allow(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
1780                           struct iwl_lq_sta *lq_sta)
1781 {
1782         struct iwl_mvm_sta *mvmsta = iwl_mvm_sta_from_mac80211(sta);
1783         struct ieee80211_vif *vif = mvmsta->vif;
1784         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1785                                 !vif->bss_conf.ps);
1786
1787         /* Our chip supports Tx STBC and the peer is an HT/VHT STA which
1788          * supports STBC of at least 1*SS
1789          */
1790         if (!lq_sta->stbc)
1791                 return false;
1792
1793         if (!mvm->ps_disabled && !sta_ps_disabled)
1794                 return false;
1795
1796         if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
1797                 return false;
1798
1799         return true;
1800 }
1801
1802 static void rs_get_adjacent_txp(struct iwl_mvm *mvm, int index,
1803                                 int *weaker, int *stronger)
1804 {
1805         *weaker = index + TPC_TX_POWER_STEP;
1806         if (*weaker > TPC_MAX_REDUCTION)
1807                 *weaker = TPC_INVALID;
1808
1809         *stronger = index - TPC_TX_POWER_STEP;
1810         if (*stronger < 0)
1811                 *stronger = TPC_INVALID;
1812 }
1813
1814 static bool rs_tpc_allowed(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
1815                            struct rs_rate *rate, enum ieee80211_band band)
1816 {
1817         int index = rate->index;
1818         bool cam = (iwlmvm_mod_params.power_scheme == IWL_POWER_SCHEME_CAM);
1819         bool sta_ps_disabled = (vif->type == NL80211_IFTYPE_STATION &&
1820                                 !vif->bss_conf.ps);
1821
1822         IWL_DEBUG_RATE(mvm, "cam: %d sta_ps_disabled %d\n",
1823                        cam, sta_ps_disabled);
1824         /*
1825          * allow tpc only if power management is enabled, or bt coex
1826          * activity grade allows it and we are on 2.4Ghz.
1827          */
1828         if ((cam || sta_ps_disabled) &&
1829             !iwl_mvm_bt_coex_is_tpc_allowed(mvm, band))
1830                 return false;
1831
1832         IWL_DEBUG_RATE(mvm, "check rate, table type: %d\n", rate->type);
1833         if (is_legacy(rate))
1834                 return index == IWL_RATE_54M_INDEX;
1835         if (is_ht(rate))
1836                 return index == IWL_RATE_MCS_7_INDEX;
1837         if (is_vht(rate))
1838                 return index == IWL_RATE_MCS_7_INDEX ||
1839                        index == IWL_RATE_MCS_8_INDEX ||
1840                        index == IWL_RATE_MCS_9_INDEX;
1841
1842         WARN_ON_ONCE(1);
1843         return false;
1844 }
1845
1846 enum tpc_action {
1847         TPC_ACTION_STAY,
1848         TPC_ACTION_DECREASE,
1849         TPC_ACTION_INCREASE,
1850         TPC_ACTION_NO_RESTIRCTION,
1851 };
1852
1853 static enum tpc_action rs_get_tpc_action(struct iwl_mvm *mvm,
1854                                          s32 sr, int weak, int strong,
1855                                          int current_tpt,
1856                                          int weak_tpt, int strong_tpt)
1857 {
1858         /* stay until we have valid tpt */
1859         if (current_tpt == IWL_INVALID_VALUE) {
1860                 IWL_DEBUG_RATE(mvm, "no current tpt. stay.\n");
1861                 return TPC_ACTION_STAY;
1862         }
1863
1864         /* Too many failures, increase txp */
1865         if (sr <= TPC_SR_FORCE_INCREASE || current_tpt == 0) {
1866                 IWL_DEBUG_RATE(mvm, "increase txp because of weak SR\n");
1867                 return TPC_ACTION_NO_RESTIRCTION;
1868         }
1869
1870         /* try decreasing first if applicable */
1871         if (weak != TPC_INVALID) {
1872                 if (weak_tpt == IWL_INVALID_VALUE &&
1873                     (strong_tpt == IWL_INVALID_VALUE ||
1874                      current_tpt >= strong_tpt)) {
1875                         IWL_DEBUG_RATE(mvm,
1876                                        "no weak txp measurement. decrease txp\n");
1877                         return TPC_ACTION_DECREASE;
1878                 }
1879
1880                 if (weak_tpt > current_tpt) {
1881                         IWL_DEBUG_RATE(mvm,
1882                                        "lower txp has better tpt. decrease txp\n");
1883                         return TPC_ACTION_DECREASE;
1884                 }
1885         }
1886
1887         /* next, increase if needed */
1888         if (sr < TPC_SR_NO_INCREASE && strong != TPC_INVALID) {
1889                 if (weak_tpt == IWL_INVALID_VALUE &&
1890                     strong_tpt != IWL_INVALID_VALUE &&
1891                     current_tpt < strong_tpt) {
1892                         IWL_DEBUG_RATE(mvm,
1893                                        "higher txp has better tpt. increase txp\n");
1894                         return TPC_ACTION_INCREASE;
1895                 }
1896
1897                 if (weak_tpt < current_tpt &&
1898                     (strong_tpt == IWL_INVALID_VALUE ||
1899                      strong_tpt > current_tpt)) {
1900                         IWL_DEBUG_RATE(mvm,
1901                                        "lower txp has worse tpt. increase txp\n");
1902                         return TPC_ACTION_INCREASE;
1903                 }
1904         }
1905
1906         IWL_DEBUG_RATE(mvm, "no need to increase or decrease txp - stay\n");
1907         return TPC_ACTION_STAY;
1908 }
1909
1910 static bool rs_tpc_perform(struct iwl_mvm *mvm,
1911                            struct ieee80211_sta *sta,
1912                            struct iwl_lq_sta *lq_sta,
1913                            struct iwl_scale_tbl_info *tbl)
1914 {
1915         struct iwl_mvm_sta *mvm_sta = (void *)sta->drv_priv;
1916         struct ieee80211_vif *vif = mvm_sta->vif;
1917         struct ieee80211_chanctx_conf *chanctx_conf;
1918         enum ieee80211_band band;
1919         struct iwl_rate_scale_data *window;
1920         struct rs_rate *rate = &tbl->rate;
1921         enum tpc_action action;
1922         s32 sr;
1923         u8 cur = lq_sta->lq.reduced_tpc;
1924         int current_tpt;
1925         int weak, strong;
1926         int weak_tpt = IWL_INVALID_VALUE, strong_tpt = IWL_INVALID_VALUE;
1927
1928 #ifdef CONFIG_MAC80211_DEBUGFS
1929         if (lq_sta->pers.dbg_fixed_txp_reduction <= TPC_MAX_REDUCTION) {
1930                 IWL_DEBUG_RATE(mvm, "fixed tpc: %d\n",
1931                                lq_sta->pers.dbg_fixed_txp_reduction);
1932                 lq_sta->lq.reduced_tpc = lq_sta->pers.dbg_fixed_txp_reduction;
1933                 return cur != lq_sta->pers.dbg_fixed_txp_reduction;
1934         }
1935 #endif
1936
1937         rcu_read_lock();
1938         chanctx_conf = rcu_dereference(vif->chanctx_conf);
1939         if (WARN_ON(!chanctx_conf))
1940                 band = IEEE80211_NUM_BANDS;
1941         else
1942                 band = chanctx_conf->def.chan->band;
1943         rcu_read_unlock();
1944
1945         if (!rs_tpc_allowed(mvm, vif, rate, band)) {
1946                 IWL_DEBUG_RATE(mvm,
1947                                "tpc is not allowed. remove txp restrictions\n");
1948                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1949                 return cur != TPC_NO_REDUCTION;
1950         }
1951
1952         rs_get_adjacent_txp(mvm, cur, &weak, &strong);
1953
1954         /* Collect measured throughputs for current and adjacent rates */
1955         window = tbl->tpc_win;
1956         sr = window[cur].success_ratio;
1957         current_tpt = window[cur].average_tpt;
1958         if (weak != TPC_INVALID)
1959                 weak_tpt = window[weak].average_tpt;
1960         if (strong != TPC_INVALID)
1961                 strong_tpt = window[strong].average_tpt;
1962
1963         IWL_DEBUG_RATE(mvm,
1964                        "(TPC: %d): cur_tpt %d SR %d weak %d strong %d weak_tpt %d strong_tpt %d\n",
1965                        cur, current_tpt, sr, weak, strong,
1966                        weak_tpt, strong_tpt);
1967
1968         action = rs_get_tpc_action(mvm, sr, weak, strong,
1969                                    current_tpt, weak_tpt, strong_tpt);
1970
1971         /* override actions if we are on the edge */
1972         if (weak == TPC_INVALID && action == TPC_ACTION_DECREASE) {
1973                 IWL_DEBUG_RATE(mvm, "already in lowest txp, stay\n");
1974                 action = TPC_ACTION_STAY;
1975         } else if (strong == TPC_INVALID &&
1976                    (action == TPC_ACTION_INCREASE ||
1977                     action == TPC_ACTION_NO_RESTIRCTION)) {
1978                 IWL_DEBUG_RATE(mvm, "already in highest txp, stay\n");
1979                 action = TPC_ACTION_STAY;
1980         }
1981
1982         switch (action) {
1983         case TPC_ACTION_DECREASE:
1984                 lq_sta->lq.reduced_tpc = weak;
1985                 return true;
1986         case TPC_ACTION_INCREASE:
1987                 lq_sta->lq.reduced_tpc = strong;
1988                 return true;
1989         case TPC_ACTION_NO_RESTIRCTION:
1990                 lq_sta->lq.reduced_tpc = TPC_NO_REDUCTION;
1991                 return true;
1992         case TPC_ACTION_STAY:
1993                 /* do nothing */
1994                 break;
1995         }
1996         return false;
1997 }
1998
1999 /*
2000  * Do rate scaling and search for new modulation mode.
2001  */
2002 static void rs_rate_scale_perform(struct iwl_mvm *mvm,
2003                                   struct ieee80211_sta *sta,
2004                                   struct iwl_lq_sta *lq_sta,
2005                                   int tid)
2006 {
2007         int low = IWL_RATE_INVALID;
2008         int high = IWL_RATE_INVALID;
2009         int index;
2010         struct iwl_rate_scale_data *window = NULL;
2011         int current_tpt = IWL_INVALID_VALUE;
2012         int low_tpt = IWL_INVALID_VALUE;
2013         int high_tpt = IWL_INVALID_VALUE;
2014         u32 fail_count;
2015         enum rs_action scale_action = RS_ACTION_STAY;
2016         u16 rate_mask;
2017         u8 update_lq = 0;
2018         struct iwl_scale_tbl_info *tbl, *tbl1;
2019         u8 active_tbl = 0;
2020         u8 done_search = 0;
2021         u16 high_low;
2022         s32 sr;
2023         u8 prev_agg = lq_sta->is_agg;
2024         struct iwl_mvm_sta *sta_priv = (void *)sta->drv_priv;
2025         struct iwl_mvm_tid_data *tid_data;
2026         struct rs_rate *rate;
2027
2028         lq_sta->is_agg = !!sta_priv->agg_tids;
2029
2030         /*
2031          * Select rate-scale / modulation-mode table to work with in
2032          * the rest of this function:  "search" if searching for better
2033          * modulation mode, or "active" if doing rate scaling within a mode.
2034          */
2035         if (!lq_sta->search_better_tbl)
2036                 active_tbl = lq_sta->active_tbl;
2037         else
2038                 active_tbl = 1 - lq_sta->active_tbl;
2039
2040         tbl = &(lq_sta->lq_info[active_tbl]);
2041         rate = &tbl->rate;
2042
2043         if (prev_agg != lq_sta->is_agg) {
2044                 IWL_DEBUG_RATE(mvm,
2045                                "Aggregation changed: prev %d current %d. Update expected TPT table\n",
2046                                prev_agg, lq_sta->is_agg);
2047                 rs_set_expected_tpt_table(lq_sta, tbl);
2048                 rs_rate_scale_clear_tbl_windows(mvm, tbl);
2049         }
2050
2051         /* current tx rate */
2052         index = lq_sta->last_txrate_idx;
2053
2054         /* rates available for this association, and for modulation mode */
2055         rate_mask = rs_get_supported_rates(lq_sta, rate);
2056
2057         if (!(BIT(index) & rate_mask)) {
2058                 IWL_ERR(mvm, "Current Rate is not valid\n");
2059                 if (lq_sta->search_better_tbl) {
2060                         /* revert to active table if search table is not valid*/
2061                         rate->type = LQ_NONE;
2062                         lq_sta->search_better_tbl = 0;
2063                         tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
2064                         rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2065                 }
2066                 return;
2067         }
2068
2069         /* Get expected throughput table and history window for current rate */
2070         if (!tbl->expected_tpt) {
2071                 IWL_ERR(mvm, "tbl->expected_tpt is NULL\n");
2072                 return;
2073         }
2074
2075         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2076         window = &(tbl->win[index]);
2077
2078         /*
2079          * If there is not enough history to calculate actual average
2080          * throughput, keep analyzing results of more tx frames, without
2081          * changing rate or mode (bypass most of the rest of this function).
2082          * Set up new rate table in uCode only if old rate is not supported
2083          * in current association (use new rate found above).
2084          */
2085         fail_count = window->counter - window->success_counter;
2086         if ((fail_count < IWL_RATE_MIN_FAILURE_TH) &&
2087             (window->success_counter < IWL_RATE_MIN_SUCCESS_TH)) {
2088                 IWL_DEBUG_RATE(mvm,
2089                                "(%s: %d): Test Window: succ %d total %d\n",
2090                                rs_pretty_lq_type(rate->type),
2091                                index, window->success_counter, window->counter);
2092
2093                 /* Can't calculate this yet; not enough history */
2094                 window->average_tpt = IWL_INVALID_VALUE;
2095
2096                 /* Should we stay with this modulation mode,
2097                  * or search for a new one? */
2098                 rs_stay_in_table(lq_sta, false);
2099
2100                 goto out;
2101         }
2102         /* Else we have enough samples; calculate estimate of
2103          * actual average throughput */
2104         if (window->average_tpt != ((window->success_ratio *
2105                         tbl->expected_tpt[index] + 64) / 128)) {
2106                 window->average_tpt = ((window->success_ratio *
2107                                         tbl->expected_tpt[index] + 64) / 128);
2108         }
2109
2110         /* If we are searching for better modulation mode, check success. */
2111         if (lq_sta->search_better_tbl) {
2112                 /* If good success, continue using the "search" mode;
2113                  * no need to send new link quality command, since we're
2114                  * continuing to use the setup that we've been trying. */
2115                 if (window->average_tpt > lq_sta->last_tpt) {
2116                         IWL_DEBUG_RATE(mvm,
2117                                        "SWITCHING TO NEW TABLE SR: %d "
2118                                        "cur-tpt %d old-tpt %d\n",
2119                                        window->success_ratio,
2120                                        window->average_tpt,
2121                                        lq_sta->last_tpt);
2122
2123                         /* Swap tables; "search" becomes "active" */
2124                         lq_sta->active_tbl = active_tbl;
2125                         current_tpt = window->average_tpt;
2126                 /* Else poor success; go back to mode in "active" table */
2127                 } else {
2128                         IWL_DEBUG_RATE(mvm,
2129                                        "GOING BACK TO THE OLD TABLE: SR %d "
2130                                        "cur-tpt %d old-tpt %d\n",
2131                                        window->success_ratio,
2132                                        window->average_tpt,
2133                                        lq_sta->last_tpt);
2134
2135                         /* Nullify "search" table */
2136                         rate->type = LQ_NONE;
2137
2138                         /* Revert to "active" table */
2139                         active_tbl = lq_sta->active_tbl;
2140                         tbl = &(lq_sta->lq_info[active_tbl]);
2141
2142                         /* Revert to "active" rate and throughput info */
2143                         index = tbl->rate.index;
2144                         current_tpt = lq_sta->last_tpt;
2145
2146                         /* Need to set up a new rate table in uCode */
2147                         update_lq = 1;
2148                 }
2149
2150                 /* Either way, we've made a decision; modulation mode
2151                  * search is done, allow rate adjustment next time. */
2152                 lq_sta->search_better_tbl = 0;
2153                 done_search = 1;        /* Don't switch modes below! */
2154                 goto lq_update;
2155         }
2156
2157         /* (Else) not in search of better modulation mode, try for better
2158          * starting rate, while staying in this mode. */
2159         high_low = rs_get_adjacent_rate(mvm, index, rate_mask, rate->type);
2160         low = high_low & 0xff;
2161         high = (high_low >> 8) & 0xff;
2162
2163         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2164
2165         sr = window->success_ratio;
2166
2167         /* Collect measured throughputs for current and adjacent rates */
2168         current_tpt = window->average_tpt;
2169         if (low != IWL_RATE_INVALID)
2170                 low_tpt = tbl->win[low].average_tpt;
2171         if (high != IWL_RATE_INVALID)
2172                 high_tpt = tbl->win[high].average_tpt;
2173
2174         IWL_DEBUG_RATE(mvm,
2175                        "(%s: %d): cur_tpt %d SR %d low %d high %d low_tpt %d high_tpt %d\n",
2176                        rs_pretty_lq_type(rate->type), index, current_tpt, sr,
2177                        low, high, low_tpt, high_tpt);
2178
2179         scale_action = rs_get_rate_action(mvm, tbl, sr, low, high,
2180                                           current_tpt, low_tpt, high_tpt);
2181
2182         /* Force a search in case BT doesn't like us being in MIMO */
2183         if (is_mimo(rate) &&
2184             !iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta)) {
2185                 IWL_DEBUG_RATE(mvm,
2186                                "BT Coex forbids MIMO. Search for new config\n");
2187                 rs_stay_in_table(lq_sta, true);
2188                 goto lq_update;
2189         }
2190
2191         switch (scale_action) {
2192         case RS_ACTION_DOWNSCALE:
2193                 /* Decrease starting rate, update uCode's rate table */
2194                 if (low != IWL_RATE_INVALID) {
2195                         update_lq = 1;
2196                         index = low;
2197                 } else {
2198                         IWL_DEBUG_RATE(mvm,
2199                                        "At the bottom rate. Can't decrease\n");
2200                 }
2201
2202                 break;
2203         case RS_ACTION_UPSCALE:
2204                 /* Increase starting rate, update uCode's rate table */
2205                 if (high != IWL_RATE_INVALID) {
2206                         update_lq = 1;
2207                         index = high;
2208                 } else {
2209                         IWL_DEBUG_RATE(mvm,
2210                                        "At the top rate. Can't increase\n");
2211                 }
2212
2213                 break;
2214         case RS_ACTION_STAY:
2215                 /* No change */
2216                 if (lq_sta->rs_state == RS_STATE_STAY_IN_COLUMN)
2217                         update_lq = rs_tpc_perform(mvm, sta, lq_sta, tbl);
2218                 break;
2219         default:
2220                 break;
2221         }
2222
2223 lq_update:
2224         /* Replace uCode's rate table for the destination station. */
2225         if (update_lq) {
2226                 tbl->rate.index = index;
2227                 rs_update_rate_tbl(mvm, sta, lq_sta, &tbl->rate);
2228         }
2229
2230         rs_stay_in_table(lq_sta, false);
2231
2232         /*
2233          * Search for new modulation mode if we're:
2234          * 1)  Not changing rates right now
2235          * 2)  Not just finishing up a search
2236          * 3)  Allowing a new search
2237          */
2238         if (!update_lq && !done_search &&
2239             lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_STARTED
2240             && window->counter) {
2241                 enum rs_column next_column;
2242
2243                 /* Save current throughput to compare with "search" throughput*/
2244                 lq_sta->last_tpt = current_tpt;
2245
2246                 IWL_DEBUG_RATE(mvm,
2247                                "Start Search: update_lq %d done_search %d rs_state %d win->counter %d\n",
2248                                update_lq, done_search, lq_sta->rs_state,
2249                                window->counter);
2250
2251                 next_column = rs_get_next_column(mvm, lq_sta, sta, tbl);
2252                 if (next_column != RS_COLUMN_INVALID) {
2253                         int ret = rs_switch_to_column(mvm, lq_sta, sta,
2254                                                       next_column);
2255                         if (!ret)
2256                                 lq_sta->search_better_tbl = 1;
2257                 } else {
2258                         IWL_DEBUG_RATE(mvm,
2259                                        "No more columns to explore in search cycle. Go to RS_STATE_SEARCH_CYCLE_ENDED\n");
2260                         lq_sta->rs_state = RS_STATE_SEARCH_CYCLE_ENDED;
2261                 }
2262
2263                 /* If new "search" mode was selected, set up in uCode table */
2264                 if (lq_sta->search_better_tbl) {
2265                         /* Access the "search" table, clear its history. */
2266                         tbl = &(lq_sta->lq_info[(1 - lq_sta->active_tbl)]);
2267                         rs_rate_scale_clear_tbl_windows(mvm, tbl);
2268
2269                         /* Use new "search" start rate */
2270                         index = tbl->rate.index;
2271
2272                         rs_dump_rate(mvm, &tbl->rate,
2273                                      "Switch to SEARCH TABLE:");
2274                         rs_fill_lq_cmd(mvm, sta, lq_sta, &tbl->rate);
2275                         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, false);
2276                 } else {
2277                         done_search = 1;
2278                 }
2279         }
2280
2281         if (done_search && lq_sta->rs_state == RS_STATE_SEARCH_CYCLE_ENDED) {
2282                 /* If the "active" (non-search) mode was legacy,
2283                  * and we've tried switching antennas,
2284                  * but we haven't been able to try HT modes (not available),
2285                  * stay with best antenna legacy modulation for a while
2286                  * before next round of mode comparisons. */
2287                 tbl1 = &(lq_sta->lq_info[lq_sta->active_tbl]);
2288                 if (is_legacy(&tbl1->rate)) {
2289                         IWL_DEBUG_RATE(mvm, "LQ: STAY in legacy table\n");
2290
2291                         if (tid != IWL_MAX_TID_COUNT) {
2292                                 tid_data = &sta_priv->tid_data[tid];
2293                                 if (tid_data->state != IWL_AGG_OFF) {
2294                                         IWL_DEBUG_RATE(mvm,
2295                                                        "Stop aggregation on tid %d\n",
2296                                                        tid);
2297                                         ieee80211_stop_tx_ba_session(sta, tid);
2298                                 }
2299                         }
2300                         rs_set_stay_in_table(mvm, 1, lq_sta);
2301                 } else {
2302                 /* If we're in an HT mode, and all 3 mode switch actions
2303                  * have been tried and compared, stay in this best modulation
2304                  * mode for a while before next round of mode comparisons. */
2305                         if ((lq_sta->last_tpt > IWL_AGG_TPT_THREHOLD) &&
2306                             (lq_sta->tx_agg_tid_en & (1 << tid)) &&
2307                             (tid != IWL_MAX_TID_COUNT)) {
2308                                 tid_data = &sta_priv->tid_data[tid];
2309                                 if (tid_data->state == IWL_AGG_OFF) {
2310                                         IWL_DEBUG_RATE(mvm,
2311                                                        "try to aggregate tid %d\n",
2312                                                        tid);
2313                                         rs_tl_turn_on_agg(mvm, tid,
2314                                                           lq_sta, sta);
2315                                 }
2316                         }
2317                         rs_set_stay_in_table(mvm, 0, lq_sta);
2318                 }
2319         }
2320
2321 out:
2322         lq_sta->last_txrate_idx = index;
2323 }
2324
2325 struct rs_init_rate_info {
2326         s8 rssi;
2327         u8 rate_idx;
2328 };
2329
2330 static const struct rs_init_rate_info rs_init_rates_24ghz[] = {
2331         { -60, IWL_RATE_54M_INDEX },
2332         { -64, IWL_RATE_48M_INDEX },
2333         { -68, IWL_RATE_36M_INDEX },
2334         { -80, IWL_RATE_24M_INDEX },
2335         { -84, IWL_RATE_18M_INDEX },
2336         { -85, IWL_RATE_12M_INDEX },
2337         { -86, IWL_RATE_11M_INDEX },
2338         { -88, IWL_RATE_5M_INDEX  },
2339         { -90, IWL_RATE_2M_INDEX  },
2340         { S8_MIN, IWL_RATE_1M_INDEX },
2341 };
2342
2343 static const struct rs_init_rate_info rs_init_rates_5ghz[] = {
2344         { -60, IWL_RATE_54M_INDEX },
2345         { -64, IWL_RATE_48M_INDEX },
2346         { -72, IWL_RATE_36M_INDEX },
2347         { -80, IWL_RATE_24M_INDEX },
2348         { -84, IWL_RATE_18M_INDEX },
2349         { -85, IWL_RATE_12M_INDEX },
2350         { -87, IWL_RATE_9M_INDEX  },
2351         { S8_MIN, IWL_RATE_6M_INDEX },
2352 };
2353
2354 /* Choose an initial legacy rate and antenna to use based on the RSSI
2355  * of last Rx
2356  */
2357 static void rs_get_initial_rate(struct iwl_mvm *mvm,
2358                                 struct iwl_lq_sta *lq_sta,
2359                                 enum ieee80211_band band,
2360                                 struct rs_rate *rate)
2361 {
2362         int i, nentries;
2363         s8 best_rssi = S8_MIN;
2364         u8 best_ant = ANT_NONE;
2365         u8 valid_tx_ant = mvm->fw->valid_tx_ant;
2366         const struct rs_init_rate_info *initial_rates;
2367
2368         for (i = 0; i < ARRAY_SIZE(lq_sta->pers.chain_signal); i++) {
2369                 if (!(lq_sta->pers.chains & BIT(i)))
2370                         continue;
2371
2372                 if (lq_sta->pers.chain_signal[i] > best_rssi) {
2373                         best_rssi = lq_sta->pers.chain_signal[i];
2374                         best_ant = BIT(i);
2375                 }
2376         }
2377
2378         IWL_DEBUG_RATE(mvm, "Best ANT: %s Best RSSI: %d\n",
2379                        rs_pretty_ant(best_ant), best_rssi);
2380
2381         if (best_ant != ANT_A && best_ant != ANT_B)
2382                 rate->ant = first_antenna(valid_tx_ant);
2383         else
2384                 rate->ant = best_ant;
2385
2386         rate->sgi = false;
2387         rate->ldpc = false;
2388         rate->bw = RATE_MCS_CHAN_WIDTH_20;
2389
2390         rate->index = find_first_bit(&lq_sta->active_legacy_rate,
2391                                      BITS_PER_LONG);
2392
2393         if (band == IEEE80211_BAND_5GHZ) {
2394                 rate->type = LQ_LEGACY_A;
2395                 initial_rates = rs_init_rates_5ghz;
2396                 nentries = ARRAY_SIZE(rs_init_rates_5ghz);
2397         } else {
2398                 rate->type = LQ_LEGACY_G;
2399                 initial_rates = rs_init_rates_24ghz;
2400                 nentries = ARRAY_SIZE(rs_init_rates_24ghz);
2401         }
2402
2403         if (IWL_MVM_RS_RSSI_BASED_INIT_RATE) {
2404                 for (i = 0; i < nentries; i++) {
2405                         int rate_idx = initial_rates[i].rate_idx;
2406                         if ((best_rssi >= initial_rates[i].rssi) &&
2407                             (BIT(rate_idx) & lq_sta->active_legacy_rate)) {
2408                                 rate->index = rate_idx;
2409                                 break;
2410                         }
2411                 }
2412         }
2413
2414         IWL_DEBUG_RATE(mvm, "rate_idx %d ANT %s\n", rate->index,
2415                        rs_pretty_ant(rate->ant));
2416 }
2417
2418 /* Save info about RSSI of last Rx */
2419 void rs_update_last_rssi(struct iwl_mvm *mvm,
2420                          struct iwl_lq_sta *lq_sta,
2421                          struct ieee80211_rx_status *rx_status)
2422 {
2423         lq_sta->pers.chains = rx_status->chains;
2424         lq_sta->pers.chain_signal[0] = rx_status->chain_signal[0];
2425         lq_sta->pers.chain_signal[1] = rx_status->chain_signal[1];
2426         lq_sta->pers.chain_signal[2] = rx_status->chain_signal[2];
2427 }
2428
2429 /**
2430  * rs_initialize_lq - Initialize a station's hardware rate table
2431  *
2432  * The uCode's station table contains a table of fallback rates
2433  * for automatic fallback during transmission.
2434  *
2435  * NOTE: This sets up a default set of values.  These will be replaced later
2436  *       if the driver's iwl-agn-rs rate scaling algorithm is used, instead of
2437  *       rc80211_simple.
2438  *
2439  * NOTE: Run REPLY_ADD_STA command to set up station table entry, before
2440  *       calling this function (which runs REPLY_TX_LINK_QUALITY_CMD,
2441  *       which requires station table entry to exist).
2442  */
2443 static void rs_initialize_lq(struct iwl_mvm *mvm,
2444                              struct ieee80211_sta *sta,
2445                              struct iwl_lq_sta *lq_sta,
2446                              enum ieee80211_band band,
2447                              bool init)
2448 {
2449         struct iwl_scale_tbl_info *tbl;
2450         struct rs_rate *rate;
2451         u8 active_tbl = 0;
2452
2453         if (!sta || !lq_sta)
2454                 return;
2455
2456         if (!lq_sta->search_better_tbl)
2457                 active_tbl = lq_sta->active_tbl;
2458         else
2459                 active_tbl = 1 - lq_sta->active_tbl;
2460
2461         tbl = &(lq_sta->lq_info[active_tbl]);
2462         rate = &tbl->rate;
2463
2464         rs_get_initial_rate(mvm, lq_sta, band, rate);
2465         lq_sta->last_txrate_idx = rate->index;
2466
2467         WARN_ON_ONCE(rate->ant != ANT_A && rate->ant != ANT_B);
2468         if (rate->ant == ANT_A)
2469                 tbl->column = RS_COLUMN_LEGACY_ANT_A;
2470         else
2471                 tbl->column = RS_COLUMN_LEGACY_ANT_B;
2472
2473         rs_set_expected_tpt_table(lq_sta, tbl);
2474         rs_fill_lq_cmd(mvm, sta, lq_sta, rate);
2475         /* TODO restore station should remember the lq cmd */
2476         iwl_mvm_send_lq_cmd(mvm, &lq_sta->lq, init);
2477 }
2478
2479 static void rs_get_rate(void *mvm_r, struct ieee80211_sta *sta, void *mvm_sta,
2480                         struct ieee80211_tx_rate_control *txrc)
2481 {
2482         struct sk_buff *skb = txrc->skb;
2483         struct iwl_op_mode *op_mode __maybe_unused =
2484                         (struct iwl_op_mode *)mvm_r;
2485         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
2486         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
2487         struct iwl_lq_sta *lq_sta = mvm_sta;
2488
2489         /* TODO: handle rate_idx_mask and rate_idx_mcs_mask */
2490
2491         /* Treat uninitialized rate scaling data same as non-existing. */
2492         if (lq_sta && !lq_sta->pers.drv) {
2493                 IWL_DEBUG_RATE(mvm, "Rate scaling not initialized yet.\n");
2494                 mvm_sta = NULL;
2495         }
2496
2497         /* Send management frames and NO_ACK data using lowest rate. */
2498         if (rate_control_send_low(sta, mvm_sta, txrc))
2499                 return;
2500
2501         iwl_mvm_hwrate_to_tx_rate(lq_sta->last_rate_n_flags,
2502                                   info->band, &info->control.rates[0]);
2503
2504         info->control.rates[0].count = 1;
2505 }
2506
2507 static void *rs_alloc_sta(void *mvm_rate, struct ieee80211_sta *sta,
2508                           gfp_t gfp)
2509 {
2510         struct iwl_mvm_sta *sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2511         struct iwl_op_mode *op_mode = (struct iwl_op_mode *)mvm_rate;
2512         struct iwl_mvm *mvm  = IWL_OP_MODE_GET_MVM(op_mode);
2513         struct iwl_lq_sta *lq_sta = &sta_priv->lq_sta;
2514
2515         IWL_DEBUG_RATE(mvm, "create station rate scale window\n");
2516
2517         lq_sta->pers.drv = mvm;
2518 #ifdef CONFIG_MAC80211_DEBUGFS
2519         lq_sta->pers.dbg_fixed_rate = 0;
2520         lq_sta->pers.dbg_fixed_txp_reduction = TPC_INVALID;
2521 #endif
2522         lq_sta->pers.chains = 0;
2523         memset(lq_sta->pers.chain_signal, 0, sizeof(lq_sta->pers.chain_signal));
2524
2525         return &sta_priv->lq_sta;
2526 }
2527
2528 static int rs_vht_highest_rx_mcs_index(struct ieee80211_sta_vht_cap *vht_cap,
2529                                        int nss)
2530 {
2531         u16 rx_mcs = le16_to_cpu(vht_cap->vht_mcs.rx_mcs_map) &
2532                 (0x3 << (2 * (nss - 1)));
2533         rx_mcs >>= (2 * (nss - 1));
2534
2535         if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_7)
2536                 return IWL_RATE_MCS_7_INDEX;
2537         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_8)
2538                 return IWL_RATE_MCS_8_INDEX;
2539         else if (rx_mcs == IEEE80211_VHT_MCS_SUPPORT_0_9)
2540                 return IWL_RATE_MCS_9_INDEX;
2541
2542         WARN_ON_ONCE(rx_mcs != IEEE80211_VHT_MCS_NOT_SUPPORTED);
2543         return -1;
2544 }
2545
2546 static void rs_vht_set_enabled_rates(struct ieee80211_sta *sta,
2547                                      struct ieee80211_sta_vht_cap *vht_cap,
2548                                      struct iwl_lq_sta *lq_sta)
2549 {
2550         int i;
2551         int highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 1);
2552
2553         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2554                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2555                         if (i == IWL_RATE_9M_INDEX)
2556                                 continue;
2557
2558                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2559                         if (i == IWL_RATE_MCS_9_INDEX &&
2560                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2561                                 continue;
2562
2563                         lq_sta->active_siso_rate |= BIT(i);
2564                 }
2565         }
2566
2567         if (sta->rx_nss < 2)
2568                 return;
2569
2570         highest_mcs = rs_vht_highest_rx_mcs_index(vht_cap, 2);
2571         if (highest_mcs >= IWL_RATE_MCS_0_INDEX) {
2572                 for (i = IWL_RATE_MCS_0_INDEX; i <= highest_mcs; i++) {
2573                         if (i == IWL_RATE_9M_INDEX)
2574                                 continue;
2575
2576                         /* VHT MCS9 isn't valid for 20Mhz for NSS=1,2 */
2577                         if (i == IWL_RATE_MCS_9_INDEX &&
2578                             sta->bandwidth == IEEE80211_STA_RX_BW_20)
2579                                 continue;
2580
2581                         lq_sta->active_mimo2_rate |= BIT(i);
2582                 }
2583         }
2584 }
2585
2586 #ifdef CONFIG_IWLWIFI_DEBUGFS
2587 static void iwl_mvm_reset_frame_stats(struct iwl_mvm *mvm,
2588                                       struct iwl_mvm_frame_stats *stats)
2589 {
2590         spin_lock_bh(&mvm->drv_stats_lock);
2591         memset(stats, 0, sizeof(*stats));
2592         spin_unlock_bh(&mvm->drv_stats_lock);
2593 }
2594
2595 void iwl_mvm_update_frame_stats(struct iwl_mvm *mvm,
2596                                 struct iwl_mvm_frame_stats *stats,
2597                                 u32 rate, bool agg)
2598 {
2599         u8 nss = 0, mcs = 0;
2600
2601         spin_lock(&mvm->drv_stats_lock);
2602
2603         if (agg)
2604                 stats->agg_frames++;
2605
2606         stats->success_frames++;
2607
2608         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
2609         case RATE_MCS_CHAN_WIDTH_20:
2610                 stats->bw_20_frames++;
2611                 break;
2612         case RATE_MCS_CHAN_WIDTH_40:
2613                 stats->bw_40_frames++;
2614                 break;
2615         case RATE_MCS_CHAN_WIDTH_80:
2616                 stats->bw_80_frames++;
2617                 break;
2618         default:
2619                 WARN_ONCE(1, "bad BW. rate 0x%x", rate);
2620         }
2621
2622         if (rate & RATE_MCS_HT_MSK) {
2623                 stats->ht_frames++;
2624                 mcs = rate & RATE_HT_MCS_RATE_CODE_MSK;
2625                 nss = ((rate & RATE_HT_MCS_NSS_MSK) >> RATE_HT_MCS_NSS_POS) + 1;
2626         } else if (rate & RATE_MCS_VHT_MSK) {
2627                 stats->vht_frames++;
2628                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
2629                 nss = ((rate & RATE_VHT_MCS_NSS_MSK) >>
2630                        RATE_VHT_MCS_NSS_POS) + 1;
2631         } else {
2632                 stats->legacy_frames++;
2633         }
2634
2635         if (nss == 1)
2636                 stats->siso_frames++;
2637         else if (nss == 2)
2638                 stats->mimo2_frames++;
2639
2640         if (rate & RATE_MCS_SGI_MSK)
2641                 stats->sgi_frames++;
2642         else
2643                 stats->ngi_frames++;
2644
2645         stats->last_rates[stats->last_frame_idx] = rate;
2646         stats->last_frame_idx = (stats->last_frame_idx + 1) %
2647                 ARRAY_SIZE(stats->last_rates);
2648
2649         spin_unlock(&mvm->drv_stats_lock);
2650 }
2651 #endif
2652
2653 /*
2654  * Called after adding a new station to initialize rate scaling
2655  */
2656 void iwl_mvm_rs_rate_init(struct iwl_mvm *mvm, struct ieee80211_sta *sta,
2657                           enum ieee80211_band band, bool init)
2658 {
2659         int i, j;
2660         struct ieee80211_hw *hw = mvm->hw;
2661         struct ieee80211_sta_ht_cap *ht_cap = &sta->ht_cap;
2662         struct ieee80211_sta_vht_cap *vht_cap = &sta->vht_cap;
2663         struct iwl_mvm_sta *sta_priv;
2664         struct iwl_lq_sta *lq_sta;
2665         struct ieee80211_supported_band *sband;
2666         unsigned long supp; /* must be unsigned long for for_each_set_bit */
2667
2668         sta_priv = (struct iwl_mvm_sta *)sta->drv_priv;
2669         lq_sta = &sta_priv->lq_sta;
2670
2671         /* clear all non-persistent lq data */
2672         memset(lq_sta, 0, offsetof(typeof(*lq_sta), pers));
2673
2674         sband = hw->wiphy->bands[band];
2675
2676         lq_sta->lq.sta_id = sta_priv->sta_id;
2677
2678         for (j = 0; j < LQ_SIZE; j++)
2679                 rs_rate_scale_clear_tbl_windows(mvm, &lq_sta->lq_info[j]);
2680
2681         lq_sta->flush_timer = 0;
2682         lq_sta->last_tx = jiffies;
2683
2684         IWL_DEBUG_RATE(mvm,
2685                        "LQ: *** rate scale station global init for station %d ***\n",
2686                        sta_priv->sta_id);
2687         /* TODO: what is a good starting rate for STA? About middle? Maybe not
2688          * the lowest or the highest rate.. Could consider using RSSI from
2689          * previous packets? Need to have IEEE 802.1X auth succeed immediately
2690          * after assoc.. */
2691
2692         lq_sta->missed_rate_counter = IWL_MISSED_RATE_MAX;
2693         lq_sta->band = sband->band;
2694         /*
2695          * active legacy rates as per supported rates bitmap
2696          */
2697         supp = sta->supp_rates[sband->band];
2698         lq_sta->active_legacy_rate = 0;
2699         for_each_set_bit(i, &supp, BITS_PER_LONG)
2700                 lq_sta->active_legacy_rate |= BIT(sband->bitrates[i].hw_value);
2701
2702         /* TODO: should probably account for rx_highest for both HT/VHT */
2703         if (!vht_cap || !vht_cap->vht_supported) {
2704                 /* active_siso_rate mask includes 9 MBits (bit 5),
2705                  * and CCK (bits 0-3), supp_rates[] does not;
2706                  * shift to convert format, force 9 MBits off.
2707                  */
2708                 lq_sta->active_siso_rate = ht_cap->mcs.rx_mask[0] << 1;
2709                 lq_sta->active_siso_rate |= ht_cap->mcs.rx_mask[0] & 0x1;
2710                 lq_sta->active_siso_rate &= ~((u16)0x2);
2711                 lq_sta->active_siso_rate <<= IWL_FIRST_OFDM_RATE;
2712
2713                 /* Same here */
2714                 lq_sta->active_mimo2_rate = ht_cap->mcs.rx_mask[1] << 1;
2715                 lq_sta->active_mimo2_rate |= ht_cap->mcs.rx_mask[1] & 0x1;
2716                 lq_sta->active_mimo2_rate &= ~((u16)0x2);
2717                 lq_sta->active_mimo2_rate <<= IWL_FIRST_OFDM_RATE;
2718
2719                 lq_sta->is_vht = false;
2720                 if (mvm->cfg->ht_params->ldpc &&
2721                     (ht_cap->cap & IEEE80211_HT_CAP_LDPC_CODING))
2722                         lq_sta->ldpc = true;
2723
2724                 if (mvm->cfg->ht_params->stbc &&
2725                     (num_of_ant(mvm->fw->valid_tx_ant) > 1) &&
2726                     (ht_cap->cap & IEEE80211_HT_CAP_RX_STBC))
2727                         lq_sta->stbc = true;
2728         } else {
2729                 rs_vht_set_enabled_rates(sta, vht_cap, lq_sta);
2730                 lq_sta->is_vht = true;
2731
2732                 if (mvm->cfg->ht_params->ldpc &&
2733                     (vht_cap->cap & IEEE80211_VHT_CAP_RXLDPC))
2734                         lq_sta->ldpc = true;
2735
2736                 if (mvm->cfg->ht_params->stbc &&
2737                     (num_of_ant(mvm->fw->valid_tx_ant) > 1) &&
2738                     (vht_cap->cap & IEEE80211_VHT_CAP_RXSTBC_MASK))
2739                         lq_sta->stbc = true;
2740         }
2741
2742         if (IWL_MVM_RS_DISABLE_MIMO)
2743                 lq_sta->active_mimo2_rate = 0;
2744
2745         lq_sta->max_legacy_rate_idx = find_last_bit(&lq_sta->active_legacy_rate,
2746                                                     BITS_PER_LONG);
2747         lq_sta->max_siso_rate_idx = find_last_bit(&lq_sta->active_siso_rate,
2748                                                   BITS_PER_LONG);
2749         lq_sta->max_mimo2_rate_idx = find_last_bit(&lq_sta->active_mimo2_rate,
2750                                                    BITS_PER_LONG);
2751
2752         IWL_DEBUG_RATE(mvm,
2753                        "RATE MASK: LEGACY=%lX SISO=%lX MIMO2=%lX VHT=%d LDPC=%d STBC%d\n",
2754                        lq_sta->active_legacy_rate,
2755                        lq_sta->active_siso_rate,
2756                        lq_sta->active_mimo2_rate,
2757                        lq_sta->is_vht, lq_sta->ldpc, lq_sta->stbc);
2758         IWL_DEBUG_RATE(mvm, "MAX RATE: LEGACY=%d SISO=%d MIMO2=%d\n",
2759                        lq_sta->max_legacy_rate_idx,
2760                        lq_sta->max_siso_rate_idx,
2761                        lq_sta->max_mimo2_rate_idx);
2762
2763         /* These values will be overridden later */
2764         lq_sta->lq.single_stream_ant_msk =
2765                 first_antenna(mvm->fw->valid_tx_ant);
2766         lq_sta->lq.dual_stream_ant_msk = ANT_AB;
2767
2768         /* as default allow aggregation for all tids */
2769         lq_sta->tx_agg_tid_en = IWL_AGG_ALL_TID;
2770         lq_sta->is_agg = 0;
2771 #ifdef CONFIG_IWLWIFI_DEBUGFS
2772         iwl_mvm_reset_frame_stats(mvm, &mvm->drv_rx_stats);
2773 #endif
2774         rs_initialize_lq(mvm, sta, lq_sta, band, init);
2775 }
2776
2777 static void rs_rate_update(void *mvm_r,
2778                            struct ieee80211_supported_band *sband,
2779                            struct cfg80211_chan_def *chandef,
2780                            struct ieee80211_sta *sta, void *priv_sta,
2781                            u32 changed)
2782 {
2783         u8 tid;
2784         struct iwl_op_mode *op_mode  =
2785                         (struct iwl_op_mode *)mvm_r;
2786         struct iwl_mvm *mvm = IWL_OP_MODE_GET_MVM(op_mode);
2787
2788         /* Stop any ongoing aggregations as rs starts off assuming no agg */
2789         for (tid = 0; tid < IWL_MAX_TID_COUNT; tid++)
2790                 ieee80211_stop_tx_ba_session(sta, tid);
2791
2792         iwl_mvm_rs_rate_init(mvm, sta, sband->band, false);
2793 }
2794
2795 #ifdef CONFIG_MAC80211_DEBUGFS
2796 static void rs_build_rates_table_from_fixed(struct iwl_mvm *mvm,
2797                                             struct iwl_lq_cmd *lq_cmd,
2798                                             enum ieee80211_band band,
2799                                             u32 ucode_rate)
2800 {
2801         struct rs_rate rate;
2802         int i;
2803         int num_rates = ARRAY_SIZE(lq_cmd->rs_table);
2804         __le32 ucode_rate_le32 = cpu_to_le32(ucode_rate);
2805         u8 ant = (ucode_rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
2806
2807         for (i = 0; i < num_rates; i++)
2808                 lq_cmd->rs_table[i] = ucode_rate_le32;
2809
2810         rs_rate_from_ucode_rate(ucode_rate, band, &rate);
2811
2812         if (is_mimo(&rate))
2813                 lq_cmd->mimo_delim = num_rates - 1;
2814         else
2815                 lq_cmd->mimo_delim = 0;
2816
2817         lq_cmd->reduced_tpc = 0;
2818
2819         if (num_of_ant(ant) == 1)
2820                 lq_cmd->single_stream_ant_msk = ant;
2821
2822         lq_cmd->agg_frame_cnt_limit = LINK_QUAL_AGG_FRAME_LIMIT_DEF;
2823 }
2824 #endif /* CONFIG_MAC80211_DEBUGFS */
2825
2826 static void rs_fill_rates_for_column(struct iwl_mvm *mvm,
2827                                      struct iwl_lq_sta *lq_sta,
2828                                      struct rs_rate *rate,
2829                                      __le32 *rs_table, int *rs_table_index,
2830                                      int num_rates, int num_retries,
2831                                      u8 valid_tx_ant, bool toggle_ant)
2832 {
2833         int i, j;
2834         __le32 ucode_rate;
2835         bool bottom_reached = false;
2836         int prev_rate_idx = rate->index;
2837         int end = LINK_QUAL_MAX_RETRY_NUM;
2838         int index = *rs_table_index;
2839
2840         for (i = 0; i < num_rates && index < end; i++) {
2841                 ucode_rate = cpu_to_le32(ucode_rate_from_rs_rate(mvm, rate));
2842                 for (j = 0; j < num_retries && index < end; j++, index++)
2843                         rs_table[index] = ucode_rate;
2844
2845                 if (toggle_ant)
2846                         rs_toggle_antenna(valid_tx_ant, rate);
2847
2848                 prev_rate_idx = rate->index;
2849                 bottom_reached = rs_get_lower_rate_in_column(lq_sta, rate);
2850                 if (bottom_reached && !is_legacy(rate))
2851                         break;
2852         }
2853
2854         if (!bottom_reached)
2855                 rate->index = prev_rate_idx;
2856
2857         *rs_table_index = index;
2858 }
2859
2860 /* Building the rate table is non trivial. When we're in MIMO2/VHT/80Mhz/SGI
2861  * column the rate table should look like this:
2862  *
2863  * rate[0] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2864  * rate[1] 0x400D019 VHT | ANT: AB BW: 80Mhz MCS: 9 NSS: 2 SGI
2865  * rate[2] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2866  * rate[3] 0x400D018 VHT | ANT: AB BW: 80Mhz MCS: 8 NSS: 2 SGI
2867  * rate[4] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2868  * rate[5] 0x400D017 VHT | ANT: AB BW: 80Mhz MCS: 7 NSS: 2 SGI
2869  * rate[6] 0x4005007 VHT | ANT: A BW: 80Mhz MCS: 7 NSS: 1 NGI
2870  * rate[7] 0x4009006 VHT | ANT: B BW: 80Mhz MCS: 6 NSS: 1 NGI
2871  * rate[8] 0x4005005 VHT | ANT: A BW: 80Mhz MCS: 5 NSS: 1 NGI
2872  * rate[9] 0x800B Legacy | ANT: B Rate: 36 Mbps
2873  * rate[10] 0x4009 Legacy | ANT: A Rate: 24 Mbps
2874  * rate[11] 0x8007 Legacy | ANT: B Rate: 18 Mbps
2875  * rate[12] 0x4005 Legacy | ANT: A Rate: 12 Mbps
2876  * rate[13] 0x800F Legacy | ANT: B Rate: 9 Mbps
2877  * rate[14] 0x400D Legacy | ANT: A Rate: 6 Mbps
2878  * rate[15] 0x800D Legacy | ANT: B Rate: 6 Mbps
2879  */
2880 static void rs_build_rates_table(struct iwl_mvm *mvm,
2881                                  struct ieee80211_sta *sta,
2882                                  struct iwl_lq_sta *lq_sta,
2883                                  const struct rs_rate *initial_rate)
2884 {
2885         struct rs_rate rate;
2886         int num_rates, num_retries, index = 0;
2887         u8 valid_tx_ant = 0;
2888         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2889         bool toggle_ant = false;
2890
2891         memcpy(&rate, initial_rate, sizeof(rate));
2892
2893         valid_tx_ant = mvm->fw->valid_tx_ant;
2894         rate.stbc = rs_stbc_allow(mvm, sta, lq_sta);
2895
2896         if (is_siso(&rate)) {
2897                 num_rates = RS_INITIAL_SISO_NUM_RATES;
2898                 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
2899         } else if (is_mimo(&rate)) {
2900                 num_rates = RS_INITIAL_MIMO_NUM_RATES;
2901                 num_retries = RS_HT_VHT_RETRIES_PER_RATE;
2902         } else {
2903                 num_rates = RS_INITIAL_LEGACY_NUM_RATES;
2904                 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2905                 toggle_ant = true;
2906         }
2907
2908         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2909                                  num_rates, num_retries, valid_tx_ant,
2910                                  toggle_ant);
2911
2912         rs_get_lower_rate_down_column(lq_sta, &rate);
2913
2914         if (is_siso(&rate)) {
2915                 num_rates = RS_SECONDARY_SISO_NUM_RATES;
2916                 num_retries = RS_SECONDARY_SISO_RETRIES;
2917                 lq_cmd->mimo_delim = index;
2918         } else if (is_legacy(&rate)) {
2919                 num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2920                 num_retries = RS_LEGACY_RETRIES_PER_RATE;
2921         } else {
2922                 WARN_ON_ONCE(1);
2923         }
2924
2925         toggle_ant = true;
2926
2927         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2928                                  num_rates, num_retries, valid_tx_ant,
2929                                  toggle_ant);
2930
2931         rs_get_lower_rate_down_column(lq_sta, &rate);
2932
2933         num_rates = RS_SECONDARY_LEGACY_NUM_RATES;
2934         num_retries = RS_LEGACY_RETRIES_PER_RATE;
2935
2936         rs_fill_rates_for_column(mvm, lq_sta, &rate, lq_cmd->rs_table, &index,
2937                                  num_rates, num_retries, valid_tx_ant,
2938                                  toggle_ant);
2939
2940 }
2941
2942 static void rs_fill_lq_cmd(struct iwl_mvm *mvm,
2943                            struct ieee80211_sta *sta,
2944                            struct iwl_lq_sta *lq_sta,
2945                            const struct rs_rate *initial_rate)
2946 {
2947         struct iwl_lq_cmd *lq_cmd = &lq_sta->lq;
2948         struct iwl_mvm_sta *mvmsta;
2949         struct iwl_mvm_vif *mvmvif;
2950
2951         lq_cmd->agg_disable_start_th = LINK_QUAL_AGG_DISABLE_START_DEF;
2952         lq_cmd->agg_time_limit =
2953                 cpu_to_le16(LINK_QUAL_AGG_TIME_LIMIT_DEF);
2954
2955 #ifdef CONFIG_MAC80211_DEBUGFS
2956         if (lq_sta->pers.dbg_fixed_rate) {
2957                 rs_build_rates_table_from_fixed(mvm, lq_cmd,
2958                                                 lq_sta->band,
2959                                                 lq_sta->pers.dbg_fixed_rate);
2960                 return;
2961         }
2962 #endif
2963         if (WARN_ON_ONCE(!sta || !initial_rate))
2964                 return;
2965
2966         rs_build_rates_table(mvm, sta, lq_sta, initial_rate);
2967
2968         if (num_of_ant(initial_rate->ant) == 1)
2969                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
2970
2971         mvmsta = iwl_mvm_sta_from_mac80211(sta);
2972         mvmvif = iwl_mvm_vif_from_mac80211(mvmsta->vif);
2973
2974         if (num_of_ant(initial_rate->ant) == 1)
2975                 lq_cmd->single_stream_ant_msk = initial_rate->ant;
2976
2977         lq_cmd->agg_frame_cnt_limit = mvmsta->max_agg_bufsize;
2978
2979         /*
2980          * In case of low latency, tell the firwmare to leave a frame in the
2981          * Tx Fifo so that it can start a transaction in the same TxOP. This
2982          * basically allows the firmware to send bursts.
2983          */
2984         if (iwl_mvm_vif_low_latency(mvmvif)) {
2985                 lq_cmd->agg_frame_cnt_limit--;
2986
2987                 if (mvm->low_latency_agg_frame_limit)
2988                         lq_cmd->agg_frame_cnt_limit =
2989                                 min(lq_cmd->agg_frame_cnt_limit,
2990                                     mvm->low_latency_agg_frame_limit);
2991         }
2992
2993         if (mvmsta->vif->p2p)
2994                 lq_cmd->flags |= LQ_FLAG_USE_RTS_MSK;
2995
2996         lq_cmd->agg_time_limit =
2997                         cpu_to_le16(iwl_mvm_coex_agg_time_limit(mvm, sta));
2998 }
2999
3000 static void *rs_alloc(struct ieee80211_hw *hw, struct dentry *debugfsdir)
3001 {
3002         return hw->priv;
3003 }
3004 /* rate scale requires free function to be implemented */
3005 static void rs_free(void *mvm_rate)
3006 {
3007         return;
3008 }
3009
3010 static void rs_free_sta(void *mvm_r, struct ieee80211_sta *sta,
3011                         void *mvm_sta)
3012 {
3013         struct iwl_op_mode *op_mode __maybe_unused = mvm_r;
3014         struct iwl_mvm *mvm __maybe_unused = IWL_OP_MODE_GET_MVM(op_mode);
3015
3016         IWL_DEBUG_RATE(mvm, "enter\n");
3017         IWL_DEBUG_RATE(mvm, "leave\n");
3018 }
3019
3020 #ifdef CONFIG_MAC80211_DEBUGFS
3021 int rs_pretty_print_rate(char *buf, const u32 rate)
3022 {
3023
3024         char *type, *bw;
3025         u8 mcs = 0, nss = 0;
3026         u8 ant = (rate & RATE_MCS_ANT_ABC_MSK) >> RATE_MCS_ANT_POS;
3027
3028         if (!(rate & RATE_MCS_HT_MSK) &&
3029             !(rate & RATE_MCS_VHT_MSK)) {
3030                 int index = iwl_hwrate_to_plcp_idx(rate);
3031
3032                 return sprintf(buf, "Legacy | ANT: %s Rate: %s Mbps\n",
3033                                rs_pretty_ant(ant),
3034                                index == IWL_RATE_INVALID ? "BAD" :
3035                                iwl_rate_mcs[index].mbps);
3036         }
3037
3038         if (rate & RATE_MCS_VHT_MSK) {
3039                 type = "VHT";
3040                 mcs = rate & RATE_VHT_MCS_RATE_CODE_MSK;
3041                 nss = ((rate & RATE_VHT_MCS_NSS_MSK)
3042                        >> RATE_VHT_MCS_NSS_POS) + 1;
3043         } else if (rate & RATE_MCS_HT_MSK) {
3044                 type = "HT";
3045                 mcs = rate & RATE_HT_MCS_INDEX_MSK;
3046         } else {
3047                 type = "Unknown"; /* shouldn't happen */
3048         }
3049
3050         switch (rate & RATE_MCS_CHAN_WIDTH_MSK) {
3051         case RATE_MCS_CHAN_WIDTH_20:
3052                 bw = "20Mhz";
3053                 break;
3054         case RATE_MCS_CHAN_WIDTH_40:
3055                 bw = "40Mhz";
3056                 break;
3057         case RATE_MCS_CHAN_WIDTH_80:
3058                 bw = "80Mhz";
3059                 break;
3060         case RATE_MCS_CHAN_WIDTH_160:
3061                 bw = "160Mhz";
3062                 break;
3063         default:
3064                 bw = "BAD BW";
3065         }
3066
3067         return sprintf(buf, "%s | ANT: %s BW: %s MCS: %d NSS: %d %s%s%s%s%s\n",
3068                        type, rs_pretty_ant(ant), bw, mcs, nss,
3069                        (rate & RATE_MCS_SGI_MSK) ? "SGI " : "NGI ",
3070                        (rate & RATE_MCS_HT_STBC_MSK) ? "STBC " : "",
3071                        (rate & RATE_MCS_LDPC_MSK) ? "LDPC " : "",
3072                        (rate & RATE_MCS_BF_MSK) ? "BF " : "",
3073                        (rate & RATE_MCS_ZLF_MSK) ? "ZLF " : "");
3074 }
3075
3076 /**
3077  * Program the device to use fixed rate for frame transmit
3078  * This is for debugging/testing only
3079  * once the device start use fixed rate, we need to reload the module
3080  * to being back the normal operation.
3081  */
3082 static void rs_program_fix_rate(struct iwl_mvm *mvm,
3083                                 struct iwl_lq_sta *lq_sta)
3084 {
3085         lq_sta->active_legacy_rate = 0x0FFF;    /* 1 - 54 MBits, includes CCK */
3086         lq_sta->active_siso_rate   = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3087         lq_sta->active_mimo2_rate  = 0x1FD0;    /* 6 - 60 MBits, no 9, no CCK */
3088
3089         IWL_DEBUG_RATE(mvm, "sta_id %d rate 0x%X\n",
3090                        lq_sta->lq.sta_id, lq_sta->pers.dbg_fixed_rate);
3091
3092         if (lq_sta->pers.dbg_fixed_rate) {
3093                 rs_fill_lq_cmd(mvm, NULL, lq_sta, NULL);
3094                 iwl_mvm_send_lq_cmd(lq_sta->pers.drv, &lq_sta->lq, false);
3095         }
3096 }
3097
3098 static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,
3099                         const char __user *user_buf, size_t count, loff_t *ppos)
3100 {
3101         struct iwl_lq_sta *lq_sta = file->private_data;
3102         struct iwl_mvm *mvm;
3103         char buf[64];
3104         size_t buf_size;
3105         u32 parsed_rate;
3106
3107         mvm = lq_sta->pers.drv;
3108         memset(buf, 0, sizeof(buf));
3109         buf_size = min(count, sizeof(buf) -  1);
3110         if (copy_from_user(buf, user_buf, buf_size))
3111                 return -EFAULT;
3112
3113         if (sscanf(buf, "%x", &parsed_rate) == 1)
3114                 lq_sta->pers.dbg_fixed_rate = parsed_rate;
3115         else
3116                 lq_sta->pers.dbg_fixed_rate = 0;
3117
3118         rs_program_fix_rate(mvm, lq_sta);
3119
3120         return count;
3121 }
3122
3123 static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,
3124                         char __user *user_buf, size_t count, loff_t *ppos)
3125 {
3126         char *buff;
3127         int desc = 0;
3128         int i = 0;
3129         ssize_t ret;
3130
3131         struct iwl_lq_sta *lq_sta = file->private_data;
3132         struct iwl_mvm *mvm;
3133         struct iwl_scale_tbl_info *tbl = &(lq_sta->lq_info[lq_sta->active_tbl]);
3134         struct rs_rate *rate = &tbl->rate;
3135         mvm = lq_sta->pers.drv;
3136         buff = kmalloc(2048, GFP_KERNEL);
3137         if (!buff)
3138                 return -ENOMEM;
3139
3140         desc += sprintf(buff+desc, "sta_id %d\n", lq_sta->lq.sta_id);
3141         desc += sprintf(buff+desc, "failed=%d success=%d rate=0%lX\n",
3142                         lq_sta->total_failed, lq_sta->total_success,
3143                         lq_sta->active_legacy_rate);
3144         desc += sprintf(buff+desc, "fixed rate 0x%X\n",
3145                         lq_sta->pers.dbg_fixed_rate);
3146         desc += sprintf(buff+desc, "valid_tx_ant %s%s%s\n",
3147             (mvm->fw->valid_tx_ant & ANT_A) ? "ANT_A," : "",
3148             (mvm->fw->valid_tx_ant & ANT_B) ? "ANT_B," : "",
3149             (mvm->fw->valid_tx_ant & ANT_C) ? "ANT_C" : "");
3150         desc += sprintf(buff+desc, "lq type %s\n",
3151                         (is_legacy(rate)) ? "legacy" :
3152                         is_vht(rate) ? "VHT" : "HT");
3153         if (!is_legacy(rate)) {
3154                 desc += sprintf(buff+desc, " %s",
3155                    (is_siso(rate)) ? "SISO" : "MIMO2");
3156                    desc += sprintf(buff+desc, " %s",
3157                                    (is_ht20(rate)) ? "20MHz" :
3158                                    (is_ht40(rate)) ? "40MHz" :
3159                                    (is_ht80(rate)) ? "80Mhz" : "BAD BW");
3160                    desc += sprintf(buff+desc, " %s %s %s\n",
3161                                    (rate->sgi) ? "SGI" : "NGI",
3162                                    (rate->ldpc) ? "LDPC" : "BCC",
3163                                    (lq_sta->is_agg) ? "AGG on" : "");
3164         }
3165         desc += sprintf(buff+desc, "last tx rate=0x%X\n",
3166                         lq_sta->last_rate_n_flags);
3167         desc += sprintf(buff+desc,
3168                         "general: flags=0x%X mimo-d=%d s-ant=0x%x d-ant=0x%x\n",
3169                         lq_sta->lq.flags,
3170                         lq_sta->lq.mimo_delim,
3171                         lq_sta->lq.single_stream_ant_msk,
3172                         lq_sta->lq.dual_stream_ant_msk);
3173
3174         desc += sprintf(buff+desc,
3175                         "agg: time_limit=%d dist_start_th=%d frame_cnt_limit=%d\n",
3176                         le16_to_cpu(lq_sta->lq.agg_time_limit),
3177                         lq_sta->lq.agg_disable_start_th,
3178                         lq_sta->lq.agg_frame_cnt_limit);
3179
3180         desc += sprintf(buff+desc, "reduced tpc=%d\n", lq_sta->lq.reduced_tpc);
3181         desc += sprintf(buff+desc,
3182                         "Start idx [0]=0x%x [1]=0x%x [2]=0x%x [3]=0x%x\n",
3183                         lq_sta->lq.initial_rate_index[0],
3184                         lq_sta->lq.initial_rate_index[1],
3185                         lq_sta->lq.initial_rate_index[2],
3186                         lq_sta->lq.initial_rate_index[3]);
3187
3188         for (i = 0; i < LINK_QUAL_MAX_RETRY_NUM; i++) {
3189                 u32 r = le32_to_cpu(lq_sta->lq.rs_table[i]);
3190
3191                 desc += sprintf(buff+desc, " rate[%d] 0x%X ", i, r);
3192                 desc += rs_pretty_print_rate(buff+desc, r);
3193         }
3194
3195         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3196         kfree(buff);
3197         return ret;
3198 }
3199
3200 static const struct file_operations rs_sta_dbgfs_scale_table_ops = {
3201         .write = rs_sta_dbgfs_scale_table_write,
3202         .read = rs_sta_dbgfs_scale_table_read,
3203         .open = simple_open,
3204         .llseek = default_llseek,
3205 };
3206 static ssize_t rs_sta_dbgfs_stats_table_read(struct file *file,
3207                         char __user *user_buf, size_t count, loff_t *ppos)
3208 {
3209         char *buff;
3210         int desc = 0;
3211         int i, j;
3212         ssize_t ret;
3213         struct iwl_scale_tbl_info *tbl;
3214         struct rs_rate *rate;
3215         struct iwl_lq_sta *lq_sta = file->private_data;
3216
3217         buff = kmalloc(1024, GFP_KERNEL);
3218         if (!buff)
3219                 return -ENOMEM;
3220
3221         for (i = 0; i < LQ_SIZE; i++) {
3222                 tbl = &(lq_sta->lq_info[i]);
3223                 rate = &tbl->rate;
3224                 desc += sprintf(buff+desc,
3225                                 "%s type=%d SGI=%d BW=%s DUP=0\n"
3226                                 "index=%d\n",
3227                                 lq_sta->active_tbl == i ? "*" : "x",
3228                                 rate->type,
3229                                 rate->sgi,
3230                                 is_ht20(rate) ? "20Mhz" :
3231                                 is_ht40(rate) ? "40Mhz" :
3232                                 is_ht80(rate) ? "80Mhz" : "ERR",
3233                                 rate->index);
3234                 for (j = 0; j < IWL_RATE_COUNT; j++) {
3235                         desc += sprintf(buff+desc,
3236                                 "counter=%d success=%d %%=%d\n",
3237                                 tbl->win[j].counter,
3238                                 tbl->win[j].success_counter,
3239                                 tbl->win[j].success_ratio);
3240                 }
3241         }
3242         ret = simple_read_from_buffer(user_buf, count, ppos, buff, desc);
3243         kfree(buff);
3244         return ret;
3245 }
3246
3247 static const struct file_operations rs_sta_dbgfs_stats_table_ops = {
3248         .read = rs_sta_dbgfs_stats_table_read,
3249         .open = simple_open,
3250         .llseek = default_llseek,
3251 };
3252
3253 static ssize_t rs_sta_dbgfs_drv_tx_stats_read(struct file *file,
3254                                               char __user *user_buf,
3255                                               size_t count, loff_t *ppos)
3256 {
3257         static const char * const column_name[] = {
3258                 [RS_COLUMN_LEGACY_ANT_A] = "LEGACY_ANT_A",
3259                 [RS_COLUMN_LEGACY_ANT_B] = "LEGACY_ANT_B",
3260                 [RS_COLUMN_SISO_ANT_A] = "SISO_ANT_A",
3261                 [RS_COLUMN_SISO_ANT_B] = "SISO_ANT_B",
3262                 [RS_COLUMN_SISO_ANT_A_SGI] = "SISO_ANT_A_SGI",
3263                 [RS_COLUMN_SISO_ANT_B_SGI] = "SISO_ANT_B_SGI",
3264                 [RS_COLUMN_MIMO2] = "MIMO2",
3265                 [RS_COLUMN_MIMO2_SGI] = "MIMO2_SGI",
3266         };
3267
3268         static const char * const rate_name[] = {
3269                 [IWL_RATE_1M_INDEX] = "1M",
3270                 [IWL_RATE_2M_INDEX] = "2M",
3271                 [IWL_RATE_5M_INDEX] = "5.5M",
3272                 [IWL_RATE_11M_INDEX] = "11M",
3273                 [IWL_RATE_6M_INDEX] = "6M|MCS0",
3274                 [IWL_RATE_9M_INDEX] = "9M",
3275                 [IWL_RATE_12M_INDEX] = "12M|MCS1",
3276                 [IWL_RATE_18M_INDEX] = "18M|MCS2",
3277                 [IWL_RATE_24M_INDEX] = "24M|MCS3",
3278                 [IWL_RATE_36M_INDEX] = "36M|MCS4",
3279                 [IWL_RATE_48M_INDEX] = "48M|MCS5",
3280                 [IWL_RATE_54M_INDEX] = "54M|MCS6",
3281                 [IWL_RATE_MCS_7_INDEX] = "MCS7",
3282                 [IWL_RATE_MCS_8_INDEX] = "MCS8",
3283                 [IWL_RATE_MCS_9_INDEX] = "MCS9",
3284         };
3285
3286         char *buff, *pos, *endpos;
3287         int col, rate;
3288         ssize_t ret;
3289         struct iwl_lq_sta *lq_sta = file->private_data;
3290         struct rs_rate_stats *stats;
3291         static const size_t bufsz = 1024;
3292
3293         buff = kmalloc(bufsz, GFP_KERNEL);
3294         if (!buff)
3295                 return -ENOMEM;
3296
3297         pos = buff;
3298         endpos = pos + bufsz;
3299
3300         pos += scnprintf(pos, endpos - pos, "COLUMN,");
3301         for (rate = 0; rate < IWL_RATE_COUNT; rate++)
3302                 pos += scnprintf(pos, endpos - pos, "%s,", rate_name[rate]);
3303         pos += scnprintf(pos, endpos - pos, "\n");
3304
3305         for (col = 0; col < RS_COLUMN_COUNT; col++) {
3306                 pos += scnprintf(pos, endpos - pos,
3307                                  "%s,", column_name[col]);
3308
3309                 for (rate = 0; rate < IWL_RATE_COUNT; rate++) {
3310                         stats = &(lq_sta->pers.tx_stats[col][rate]);
3311                         pos += scnprintf(pos, endpos - pos,
3312                                          "%llu/%llu,",
3313                                          stats->success,
3314                                          stats->total);
3315                 }
3316                 pos += scnprintf(pos, endpos - pos, "\n");
3317         }
3318
3319         ret = simple_read_from_buffer(user_buf, count, ppos, buff, pos - buff);
3320         kfree(buff);
3321         return ret;
3322 }
3323
3324 static ssize_t rs_sta_dbgfs_drv_tx_stats_write(struct file *file,
3325                                                const char __user *user_buf,
3326                                                size_t count, loff_t *ppos)
3327 {
3328         struct iwl_lq_sta *lq_sta = file->private_data;
3329         memset(lq_sta->pers.tx_stats, 0, sizeof(lq_sta->pers.tx_stats));
3330
3331         return count;
3332 }
3333
3334 static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
3335         .read = rs_sta_dbgfs_drv_tx_stats_read,
3336         .write = rs_sta_dbgfs_drv_tx_stats_write,
3337         .open = simple_open,
3338         .llseek = default_llseek,
3339 };
3340
3341 static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
3342 {
3343         struct iwl_lq_sta *lq_sta = mvm_sta;
3344         debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
3345                             lq_sta, &rs_sta_dbgfs_scale_table_ops);
3346         debugfs_create_file("rate_stats_table", S_IRUSR, dir,
3347                             lq_sta, &rs_sta_dbgfs_stats_table_ops);
3348         debugfs_create_file("drv_tx_stats", S_IRUSR | S_IWUSR, dir,
3349                             lq_sta, &rs_sta_dbgfs_drv_tx_stats_ops);
3350         debugfs_create_u8("tx_agg_tid_enable", S_IRUSR | S_IWUSR, dir,
3351                           &lq_sta->tx_agg_tid_en);
3352         debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
3353                           &lq_sta->pers.dbg_fixed_txp_reduction);
3354 }
3355
3356 static void rs_remove_debugfs(void *mvm, void *mvm_sta)
3357 {
3358 }
3359 #endif
3360
3361 /*
3362  * Initialization of rate scaling information is done by driver after
3363  * the station is added. Since mac80211 calls this function before a
3364  * station is added we ignore it.
3365  */
3366 static void rs_rate_init_stub(void *mvm_r,
3367                               struct ieee80211_supported_band *sband,
3368                               struct cfg80211_chan_def *chandef,
3369                               struct ieee80211_sta *sta, void *mvm_sta)
3370 {
3371 }
3372
3373 static const struct rate_control_ops rs_mvm_ops = {
3374         .name = RS_NAME,
3375         .tx_status = rs_mac80211_tx_status,
3376         .get_rate = rs_get_rate,
3377         .rate_init = rs_rate_init_stub,
3378         .alloc = rs_alloc,
3379         .free = rs_free,
3380         .alloc_sta = rs_alloc_sta,
3381         .free_sta = rs_free_sta,
3382         .rate_update = rs_rate_update,
3383 #ifdef CONFIG_MAC80211_DEBUGFS
3384         .add_sta_debugfs = rs_add_debugfs,
3385         .remove_sta_debugfs = rs_remove_debugfs,
3386 #endif
3387 };
3388
3389 int iwl_mvm_rate_control_register(void)
3390 {
3391         return ieee80211_rate_control_register(&rs_mvm_ops);
3392 }
3393
3394 void iwl_mvm_rate_control_unregister(void)
3395 {
3396         ieee80211_rate_control_unregister(&rs_mvm_ops);
3397 }
3398
3399 /**
3400  * iwl_mvm_tx_protection - Gets LQ command, change it to enable/disable
3401  * Tx protection, according to this rquest and previous requests,
3402  * and send the LQ command.
3403  * @mvmsta: The station
3404  * @enable: Enable Tx protection?
3405  */
3406 int iwl_mvm_tx_protection(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
3407                           bool enable)
3408 {
3409         struct iwl_lq_cmd *lq = &mvmsta->lq_sta.lq;
3410
3411         lockdep_assert_held(&mvm->mutex);
3412
3413         if (enable) {
3414                 if (mvmsta->tx_protection == 0)
3415                         lq->flags |= LQ_FLAG_USE_RTS_MSK;
3416                 mvmsta->tx_protection++;
3417         } else {
3418                 mvmsta->tx_protection--;
3419                 if (mvmsta->tx_protection == 0)
3420                         lq->flags &= ~LQ_FLAG_USE_RTS_MSK;
3421         }
3422
3423         return iwl_mvm_send_lq_cmd(mvm, lq, false);
3424 }